GRANT PRIDECO INC
S-3/A, 2000-05-30
OIL & GAS FIELD MACHINERY & EQUIPMENT
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<PAGE>   1


      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 26, 2000



                                                   REGISTRATION NUMBER 333-35272

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------

                                AMENDMENT NO. 1


                                       TO


                                    FORM S-3

                                       ON



                                   FORM S-3/A


            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                              GRANT PRIDECO, INC.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                            <C>
                   DELAWARE                                      76-0312499
       (State of other jurisdiction of                        (I.R.S. Employer
        incorporation or organization)                      Identification No.)
</TABLE>

                       1450 LAKE ROBBINS DRIVE, SUITE 600
                           THE WOODLANDS, TEXAS 77380
                                 (281) 297-8500
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                               MR. JOHN C. COBLE
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              GRANT PRIDECO, INC.
                       1450 LAKE ROBBINS DRIVE, SUITE 600
                           THE WOODLANDS, TEXAS 77380
                                 (281) 297-8500
(Name, address, including zip code, and telephone number including area code, of
                               agent for service)

                                   Copies to:

<TABLE>
<S>                                            <C>
              CHARLES L. STRAUSS                              DAVID P. OELMAN
         FULBRIGHT & JAWORSKI L.L.P.                       ANDREWS & KURTH L.L.P.
          1301 MCKINNEY, SUITE 5100                        600 TRAVIS, SUITE 4200
          HOUSTON, TEXAS 77010-3095                         HOUSTON, TEXAS 77002
                (713) 651-5151                                 (713) 220-4200
</TABLE>

                             ---------------------
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after this registration statement becomes effective, subject to market
conditions and other factors.

     If the only Securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]

     If any of the Securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than Securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  [X]

     If this Form is filed to register additional Securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
- ---------------

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
- ---------------

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2


PROSPECTUS


                              [GRANT PRIDECO LOGO]

                                  $500,000,000

                DEBT SECURITIES, PREFERRED STOCK, COMMON STOCK,
                         DEPOSITARY SHARES AND WARRANTS

     This prospectus relates the following securities of Grant Prideco, Inc (the
"Securities"):

- - debt securities, which may be senior or subordinated debt securities;

- - preferred stock, which may be issued in the form of depositary shares;

- - common stock; and

- - warrants.

     We will provide the specific terms of the Securities in supplements to this
prospectus. This prospectus may not be used to sell Securities unless it is
accompanied by a prospectus supplement.

     Selling Security holders also may offer and sell Securities under this
prospectus.

     Our common stock is listed on the New York Stock Exchange under the trading
symbol "GRP". Any common stock sold pursuant to a prospectus supplement will be
listed on that exchange, subject to official notice of issuance.

     YOU SHOULD CAREFULLY REVIEW AND CONSIDER THE INFORMATION UNDER THE HEADING
"RISK FACTORS" BEGINNING ON PAGE 2 OF THIS PROSPECTUS AND UNDER THE SAME HEADING
IN THE APPLICABLE PROSPECTUS SUPPLEMENT BEFORE INVESTING IN SECURITIES.

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

     THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE
MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS PROHIBITED.


May 26, 2000

<PAGE>   3

                                    CONTENTS

<TABLE>
<CAPTION>
                                                               PAGE
                                                               ----
<S>                                                            <C>
About this Prospectus.......................................     1
About Grant Prideco.........................................     1
Forward-Looking Statements..................................     2
Risk Factors................................................     2
  We Generally Will Be Responsible For Taxes If Our Spinoff
     From Weatherford Is Taxable............................     2
  We May Not Have Access to Sufficient Capital Resources....     3
  Weatherford And Grant Prideco Have A Business
     Relationship; Conflicts May Arise......................     3
  Our Business Is Materially Affected By Drilling Activity
     And The Rig Count......................................     4
  An Economic Downturn Could Adversely Affect Demand For Our
     Products And Services..................................     4
  Disruptions In Foreign Operations Could Adversely Affect
     Our Income.............................................     4
  Additional Risk Factors...................................     5
Use Of Proceeds.............................................     5
Ratio Of Earnings To Fixed Charges And Earnings To Fixed
  Charges And Preferred Stock Dividends.....................     5
Description Of Debt Securities..............................     6
  Specific Terms of Each Series of Debt Securities in a
     Prospectus Supplement..................................     6
  Senior and Subordinated Debt Securities...................     7
  Subsidiary Guarantees.....................................     7
  Certain Covenants.........................................     7
     Limitations on Liens...................................     8
     Consolidation, Merger or Asset Sale....................     8
     Restriction on Sale-and-Leaseback Transactions.........     9
     Additional Covenants...................................    10
  Change of Control.........................................    10
  Events of Default and Remedies............................    10
  Modification of Indentures................................    11
  Discharging Our Obligations; Defeasance...................    11
  Registration of Notes; Minimum Denominations..............    12
  No Personal Liability of Directors, Officers, Employees
     and Stockholders.......................................    12
  Payment and Transfer......................................    12
  Book Entry, Delivery and Form.............................    12
  The Trustee...............................................    13
     Resignation or Removal of Trustee......................    13
     Limitations on Trustee if it is a Creditor of the
      Company...............................................    14
     Annual Trustee Report to Holders of Debt Securities....    14
     Certificates and Opinions to Be Furnished to Trustee...    14
Description Of Common Stock And Preferred Stock.............    14
  Common Stock..............................................    14
     Voting Rights..........................................    14
     Dividend Rights........................................    15
     Liquidation Rights and Other Provisions................    15
     Transfer Agent And Registrar...........................    15
  Preferred Stock...........................................    15
     Specific Terms of Each Series of Preferred Stock in a
      Prospectus Supplement.................................    15
     Voting Rights..........................................    16
     Dividend Rights........................................    16
     Liquidation Rights.....................................    16
     Redemption.............................................    17
     Conversion and Exchange................................    17
     Transfer Agent and Registrar...........................    17
</TABLE>

                                        i
<PAGE>   4

<TABLE>
<CAPTION>
                                                               PAGE
                                                               ----
<S>                                                            <C>
  No Preemptive Rights......................................    17
  Business Combinations With Interested Stockholders........    17
  Nomination Of Directors...................................    18
  Depositary Shares.........................................    18
     General................................................    18
     Dividends and Other Distributions......................    19
     Redemption of Depositary Shares........................    19
     Withdrawal of Preferred Stock..........................    19
     Voting the Preferred Stock.............................    19
     Amendment and Termination of Deposit Agreement.........    19
     Resignation and Removal of Depositary..................    20
     Charges of Depositary..................................    20
     Miscellaneous..........................................    20
Description Of Warrants.....................................    21
  Specific Terms of Each Series of Warrant in a Prospectus
     Supplement.............................................    21
  Exercise Of Warrants......................................    22
  Modifications.............................................    22
  Merger, Consolidation Or Sale Of Assets...................    23
  Enforceability Of Rights By Holders.......................    23
Selling Securityholders.....................................    23
Plan Of Distribution........................................    24
  Distributions By Grant Prideco............................    24
  Distribution By Selling Securityholders...................    25
Legal Matters...............................................    26
Experts.....................................................    26
Where You Can Find More Information.........................    26
Incorporation Of Certain Documents By Reference.............    26
</TABLE>

                                       ii
<PAGE>   5

                             ABOUT THIS PROSPECTUS

     This prospectus is part of a registration statement that we have filed with
the Securities and Exchange Commission using a "shelf" registration process.
Under the shelf process, we may offer any combination of the Securities
described in this prospectus in one or more offerings, and certain third parties
("Selling Securityholders") may sell Securities under this prospectus, with a
total initial offering price of up to $500,000,000 or its equivalent in foreign
currency as we may designate in prospectus supplements.

     This prospectus provides you with a general description of the debt
securities, preferred stock, common stock, depositary shares and warrants that
may be offered. Each time we use this prospectus to offer Securities, we will
provide a prospectus supplement that will contain specific information about the
terms of that offering. The prospectus supplement may also add, update or change
information contained in this prospectus.

     Any Selling Securityholders will be identified, and the type and amount of
Securities to be offered by them will be specified, in a supplement to this
prospectus. We will not receive proceeds of any sale of Securities by Selling
Securityholders.

     We may offer the Securities in amounts, at prices and on terms determined
at the time of offering. We may sell the Securities directly to you, through
agents we select, or through underwriters and dealers we select. If we use
agents, underwriters or dealers to sell the Securities, we will name them and
describe their compensation in a prospectus supplement.

     Please carefully read this prospectus and the prospectus supplement
together with the additional information described under the heading "Where You
Can Find More Information".

                              ABOUT GRANT PRIDECO

     We are an international manufacturer and supplier of products used for the
exploration and production of oil and gas. Our business is conducted through two
operating segments:

     - drill stem products and

     - premium tubulars and engineered connections.

     We are the world's leading provider of drill pipe and other drill stem
products. We are also a leading provider in North America for engineered
connections used for casing, production tubing and marine conductors and subsea
structures. Our drilling products are designed and engineered for high
performance and include all components of a drill stem from the rig floor to the
drill bit. We have been the innovators in the field of drill pipe and other
drill stem products for more than 20 years, and we are a leader in connection
technology used in the drilling of wells. Our Atlas Bradford division also has
been providing connection technology to the oil industry for approximately 50
years.

     Our company has grown substantially over the years through strategic
acquisitions and internal development. Our operations are conducted throughout
the world through manufacturing facilities located in the United States, Mexico,
Canada, Europe and Asia. We also have 19 sales, service and repair locations
around the world.

     Until April 14, 2000, we were a wholly-owned subsidiary of Weatherford
International, Inc. We were spun off from Weatherford on April 14, 2000, through
a distribution by Weatherford to its stockholders of all of our common stock. As
a result of the spinoff, our stock became publicly owned and traded on the New
York Stock Exchange under the symbol "GRP".

                                        1
<PAGE>   6

                           FORWARD-LOOKING STATEMENTS

     Statements in this document and the documents incorporated by reference
that relate to matters that are not historical facts are "forward-looking
statements" within the meaning of Section 27A of the Securities Act of 1933 and
Section 21E of the Securities Exchange Act of 1934. When used in this document
and the documents incorporated by reference, words such as "anticipate",
"believe", "could", "estimate", "expect", "intend", "may", "plan", "predict",
"project", "will" and similar expressions are intended to identify
forward-looking statements. You should be aware that these forward looking
statements are only our predictions, and we cannot guarantee any such outcomes.
Future events and actual results may differ materially from the results set
forth in or implied in the forward-looking statements. Factors that might cause
such a difference include:

     - fluctuations in worldwide prices and demand for oil and gas;

     - fluctuations in levels of oil and gas exploration and development
       activities;

     - fluctuations in the demand for contract drilling services;

     - the existence of competitors, technological changes and developments in
       the industry;

     - the existence of operating risks inherent in the contract drilling
       industry;

     - the existence of regulatory uncertainties, the possibility of political
       instability in any of the countries in which Grant Prideco does business;
       and

year 2000 issues and general economic conditions, in addition to the other
matters discussed under "Risk Factors".

                                  RISK FACTORS

     In addition to the other information contained in this prospectus and the
prospectus supplement and the documents incorporated herein by reference,
prospective investors in Securities should carefully consider the following
information.

WE GENERALLY WILL BE RESPONSIBLE FOR TAXES IF OUR SPINOFF FROM WEATHERFORD IS
TAXABLE

     In connection with our spinoff from Weatherford, Weatherford received a
favorable ruling from the Internal Revenue Service to the effect that, for
United States federal income tax purposes, the spinoff generally would be
tax-free to Weatherford and its stockholders. It is possible that Weatherford
and its stockholders could be subject to a material amount of taxes as a result
of the spinoff if the representations and undertakings Grant Prideco and
Weatherford made to the IRS in connection with obtaining that tax ruling are
determined to be inaccurate. In addition, the spinoff could be determined to be
taxable if within two years following the spinoff there were to be a change of
control of either Weatherford or Grant Prideco and Weatherford and Grant Prideco
were not able to rebut the presumption that the change in control was
contemplated at the time of the spinoff.

     We will be responsible and liable to Weatherford for any and all
corporate-level taxes or liabilities incurred by Weatherford relating to the
spinoff except to the extent the spinoff is determined to be taxable solely as a
result of a change of control of Weatherford following the spinoff. Our
obligation and liability will apply under all other circumstances, regardless of
the reason for the spinoff being determined to be taxable. This liability would
extend to circumstances within the control of Weatherford as well as
circumstances under which it is alleged or determined that there was a breach or
misrepresentation, negligent or otherwise, by Weatherford in connection with the
expected tax ruling. We also will be restricted under an agreement we have with
Weatherford from engaging in certain transactions without the consent of
Weatherford that could affect the taxability of the spinoff unless Weatherford
receives a supplemental tax ruling or an acceptable tax opinion. For a summary
of Weatherford's and Grant Prideco's obligations in connection with obtaining
the tax ruling and potential tax liabilities if the transaction is held

                                        2
<PAGE>   7

to be taxable, see "Relationship Between Grant Prideco and Weatherford After the
Spinoff -- Tax Allocation Agreement" in our Form 10 registration statement.

WE MAY NOT HAVE ACCESS TO SUFFICIENT CAPITAL RESOURCES

     We cannot assure you that we will generate or have available to us
sufficient funds to fund our planned expenditures and meet our obligations to
pay principal and interest on our debt in the future. Further, we cannot assure
you that we will be able to secure sufficient debt or equity financing to fund
our growth strategy.

     Before our spinoff from Weatherford, we relied on Weatherford for financial
support. Weatherford now has no obligation to support us financially. As a
smaller company engaged in a volatile sector of the oil and gas industry, we
expect the cost of capital to us to be greater than that which we paid as a
Weatherford subsidiary. Financing in our industry also is illiquid at this time,
and the long-term debt markets are expensive for companies of our size and
credit.

     Our strategy envisions growth through acquisitions. We expect to finance
future acquisitions through a combination of the issuance of additional equity
and debt financing, including Securities. Additional equity issuances will be
dependent on the nature of the opportunity that arises and the anticipated
accretion or dilution from the acquisition to our stockholders. Before the
spinoff, we issued a $100 million note to Weatherford, representing previous
intercompany indebtedness. Under the terms of that note, the proceeds from any
new financing (other than working capital borrowings and equity financings
issued as part of an acquisition) generally must first be applied to the
repayment of that note. This repayment obligation could affect the amount and
terms of any third party debt financing that would be available to us. The
Weatherford note will limit our ability to incur new debt, engage in certain
acquisitions and investments and make distributions to our stockholders.

     Also in connection with the spinoff, we established a credit facility to
provide us with up to $50 million for working capital purposes. This facility is
secured by our domestic inventory, equipment and receivables and guaranteed by
our domestic subsidiaries. This facility limits our ability to incur new debt,
engage in certain acquisitions and investments, invest in our foreign
operations, grant liens and make distributions to our stockholders. We cannot
assure you that this facility will be sufficient to satisfy our capital
requirements.

WEATHERFORD AND GRANT PRIDECO HAVE A BUSINESS RELATIONSHIP; CONFLICTS MAY ARISE

     The terms of the agreements we entered into with Weatherford before the
spinoff were not negotiated on an arm's-length basis and were proposed by
Weatherford as our sole stockholder. As a result, the terms of those agreements
may not reflect the terms that would have been provided to us from an unrelated
third party. Before the spinoff, Weatherford as our sole stockholder ratified
the terms of these agreements, and we acknowledged that the agreements
constitute our valid obligations.

     Persons associated with Weatherford also have a continuing relationship
with Grant Prideco. Five directors of Weatherford, Messrs. Bernard J.
Duroc-Danner, Sheldon B. Lubar, William E. Macaulay, Robert K. Moses, Jr. and
Robert A. Rayne, are also directors of Grant Prideco. These directors represent
a majority of our Board of Directors. In addition, Mr. Duroc-Danner, President,
Chief Executive Officer and Chairman of the Board of Directors of Weatherford,
serves as our Chairman of the Board, and Curtis W. Huff, Executive Vice
President, Chief Financial Officer and General Counsel of Weatherford, serves as
our Vice President and Interim General Counsel.

     The persons associated with Weatherford were asked to serve as directors or
officers of Grant Prideco because of their experience and knowledge of us and
our businesses. Although each of them has a fiduciary obligation to both
Weatherford and Grant Prideco, we cannot assure you that no conflicts of
interest will arise with them or Weatherford relating to Weatherford and Grant
Prideco. Weatherford and Grant Prideco each have adopted policies and procedures
to be followed by their respective boards of directors to limit the involvement
of Messrs. Duroc-Danner, Lubar, Macaulay, Moses and Rayne in

                                        3
<PAGE>   8

conflict situations, including requiring them to abstain from voting as a
director of either Grant Prideco or Weatherford on certain matters that present
a potential conflict of interest between the two companies. See "Relationship
Between Grant Prideco and Weatherford After the Spinoff" in our Form 10
registration statement.

OUR BUSINESS IS MATERIALLY AFFECTED BY DRILLING ACTIVITY AND THE RIG COUNT

     A material decline in either prices or drilling activity would negatively
impact our future results. Our business is materially dependent on the level of
drilling activity worldwide. During 1997 and the first half of 1998, we
benefited from an increase in drilling activity that resulted in strong demand
for our drill pipe and other drill stem products. When drilling activity
declined in the second half of 1998 and 1999, our business fell significantly.
In general, we believe that our drill stem business trails changes in the rig
count by six to nine months. The worldwide monthly rig count for each month in
1999 did not surpass the rig count for the corresponding month of 1998 until
October, and the rig counts since October 1999 have been well below the average
rig count in 1997. This suggests that our drill stem business may not recover
until later this year and will not recover completely unless rig counts continue
to rise.

AN ECONOMIC DOWNTURN COULD ADVERSELY AFFECT DEMAND FOR OUR PRODUCTS AND SERVICES

     The economic downturn that began in Asia in 1997 affected the economies in
other regions of the world, including South America and the former Soviet Union,
and contributed to the decline in the price of oil and the level of drilling
activity. Although the economy in the United States has experienced one of its
longest periods of growth in recent history, the continued strength of the
United States economy cannot be assured. If the United States or European
economies were to begin to decline or if the economies of South America or Asia
were to experience further material problems, the demand and price for oil and
gas and our products and services again could adversely affect our revenues and
income.

DISRUPTIONS IN FOREIGN OPERATIONS COULD ADVERSELY AFFECT OUR INCOME

     Our operations in certain locations outside the United States, including
Mexico, India, China and Indonesia, are subject to various political and
economic conditions existing in such countries that could disrupt operations.
These risks include (1) currency fluctuations and potential devaluations in most
countries, in particular those in South America and Asia, (2) currency
restrictions in China and India and limitations on repatriation of profits in
various countries in South America and Asia and (3) political instability in
countries such as Indonesia, India, Mexico, Venezuela, the former Soviet Union
and China. Disruptions may occur in our foreign operations and losses may occur
that will not be covered by insurance.

     Oil Country Tubular Limited ("OCTL") manufactures drill pipe and other
products for us under a long-term exclusive manufacturing arrangement. Over the
years, we have provided OCTL with a substantial amount of raw materials,
inventory and working capital for the products it manufactures for us. Our
business in India through our relationship with OCTL has been adversely affected
by the downturn of the economies in the eastern hemisphere and is subject to
various political and economic risks as well as financial and operational risks
with respect to OCTL.

     As of December 31, 1999, OCTL owed us approximately $25.1 million for prior
advances made by us to it and we had assets in India with a book value of
approximately $1.7 million. In 1999, we substantially curtailed our purchases
from OCTL, and in December of 1999, we decided to terminate our existing
manufacturing relationship with OCTL and seek an alternative arrangement for the
recovery of our prior advances. We are currently discussing with OCTL a
restructuring of our relationship that would allow OCTL to repay our prior
advances in cash, equity in OCTL or product from OCTL.

     Our decision to terminate our existing arrangement with OCTL and seek an
alternative structure resulted in our writing off a $7.8 million product deposit
previously paid to OCTL and approximately $1.7 million in property and equipment
currently located at the OCTL facility. The write off was due to the anticipated
inability to utilize the deposit and recover the equipment following the
termination of the
                                        4
<PAGE>   9

arrangement. Our remaining exposure in India is approximately $17.3 million
consisting of unpaid receivables and advances made to assist OCTL in its working
capital needs as part of our manufacturing arrangement with it. Based on
financial information of OCTL known to us and our general knowledge of the
business and assets of OCTL, OCTL would appear to have a sufficient asset and
equity value to allow for a restructuring of its remaining $17.3 million in debt
owed to us through a combination of cash, equity of OCTL or product from OCTL.
There is, however, uncertainty as to how much, if any, of the amounts owed to us
by OCTL will ultimately be collected. Accordingly, there can be no assurance
that we will be able to fully realize on the amounts owed to us by OCTL or that
additional charges relating to India will not be required in the near term as
the negotiation and collection process continues.

     We have entered into an agreement with Voest-Alpine Stahlrohr Kindberg GmbH
& Co. K.G., an entity with manufacturing operations in Austria of which we
currently own 50.01%, to purchase 45,000 tonnes of tubulars for the twelve
months ending July 2000, and 60,000 tonnes per year for the next three years.
Our future results could be adversely affected if we are unable to use or resell
these tubulars. In addition, we have agreed to be responsible for paying any
"anti-dumping" duties in the United States on the resale of these tubulars,
which could affect our ability to resell the tubulars in the United States.

ADDITIONAL RISK FACTORS

     Please see the prospectus supplement and our filings with the Securities
and Exchange Commission incorporated herein for additional risk factors that may
be applicable to a particular class or issuance of Securities or to us in the
future.

                                USE OF PROCEEDS

     Except as we may described in a prospectus supplement, we will use the net
proceeds from any sale of the Securities described in this prospectus for future
business acquisitions and other general corporate purposes, such as working
capital, investment in subsidiaries, the retirement of existing debt (if
economically prudent) and/or the repurchase of shares of common stock or other
Securities. We may also invest the proceeds in certificates of deposit, United
States government Securities or certain other interest bearing Securities until
they are used for acquisitions or general corporate purposes.

     The exact amounts to be used and when the net proceeds will be applied to
corporate purposes will depend on a number of factors, including our funding
requirements and the availability of alternative funding sources. We routinely
review acquisition opportunities. We will disclose in a prospectus supplement
any future proposal to use net proceeds from an offering of our Securities to
finance any specific acquisition, if applicable.

     We will not receive any proceeds from an sale of shares of Securities by
Selling Shareholders.

        RATIO OF EARNINGS TO FIXED CHARGES AND EARNINGS TO FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS

     We have computed the ratio of earnings to fixed charges for each of the
following periods on a consolidated basis. You should read the ratio of earnings
to fixed charges in conjunction with our consolidated financial statements
(including the notes thereto) incorporated by reference to our Registration
Statement on Form 10 or most recent Annual Report on Form 10-K as filed with the
SEC.

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                              --------------------------------
                                                              1999   1998   1997   1996   1995
                                                              ----   ----   ----   ----   ----
<S>                                                           <C>    <C>    <C>    <C>    <C>
Ratio of Earnings to Fixed Charges..........................   --    8.8    8.4    5.5    1.9
</TABLE>

     For purposes of computing the ratio of earnings to fixed charges,
"earnings" consist of pretax income from continuing operations plus fixed
charges (excluding capitalized interest). "Fixed charges" represent interest
incurred (whether expensed or capitalized), amortization of debt expense, and
that portion of

                                        5
<PAGE>   10

rental expense on operating leases deemed to be the equivalent of interest. For
the year ended December 31, 1999, earnings were insufficient to cover fixed
charges by $44.3 million.

     We were a wholly-owned subsidiary of Weatherford during the periods
presented. These ratios are based on earnings and fixed charged attributable to
us during the periods presented, and reflect allocations of certain expenses to
us. Although we believe these allocations are reasonable, they are not
necessarily indicative of the costs we would have incurred had we not been owned
by Weatherford during the periods presented. See Note 1 to our financial
statements, as incorporated herein by reference. In particular, our costs of
capital, and therefore our fixed charges, may have been higher than those
reflected in these ratios had we not been owned by Weatherford during the
periods presented.

     No preferred stock was outstanding during any of the periods presented. The
ratio of earnings to combined fixed charges and preferred stock dividends was
therefore the same as the ratio of earnings to fixed charges and is not
displayed.

                         DESCRIPTION OF DEBT SECURITIES

     The Debt Securities will be:

     - our direct unsecured general obligations; and

     - either Senior Debt Securities or Subordinated Debt Securities.

     In this section, the words "we," "us" and the "Company" refer only to Grant
Prideco, the issuer of the Debt Securities, and not our subsidiaries.
Capitalized terms used in but not defined in this "Description of Debt
Securities" have the meanings specified in the applicable Indenture.

SPECIFIC TERMS OF EACH SERIES OF DEBT SECURITIES IN A PROSPECTUS SUPPLEMENT

     The following describes general terms and provisions of the Debt Securities
to which any prospectus supplement may relate. Other terms, and the particular
terms of a specific series of Debt Securities (which differ from the terms
described below), will be described in the prospectus supplement relating to
that series. The terms of each series of Debt Securities will be governed by an
indenture or a supplemental indenture (each an "Indenture") that we will enter
into with a trustee. No Indenture will be restated in its entirety in a
prospectus supplement. We will file an Indenture relating to each series of Debt
Securities as an exhibit to the registration statement of which this prospectus
forms a part (or as an exhibit to a Current Report on Form 8-K) before we sell
those Debt Securities. You should read that Indenture, because it, and not this
description, controls the rights of holders of the applicable Debt Securities.

     A prospectus supplement and an Indenture relating to any series of Debt
Securities being offered will include specific terms relating to the offering.
These terms will include some or all of the following:

     - the form and title of the Debt Securities;

     - the total principal amount of the Debt Securities;

     - the date or dates on which the principal of the Debt Securities will be
       payable;

     - the portion of the principal amount which will be payable if the maturity
       of the Debt Securities is accelerated;

     - the currency or currency unit in which the Debt Securities will be paid;

     - any right we may have to defer payments of interest by extending the
       dates payments are due and whether interest on those deferred amounts
       will be payable as well;

     - the interest rate which the Debt Securities will bear and the interest
       payment dates for the Debt Securities;

     - any optional redemption provisions;
                                        6
<PAGE>   11

     - any sinking fund or other provisions that would obligate us to repurchase
       or otherwise redeem the Debt Securities;

     - any rights of the holders of the Debt Securities to convert or exchange
       the Debt Securities into or for our common stock, or another of our
       Securities, and the terms and conditions of the conversion or the
       exchange;

     - any changes to or additions to the Events of Default;

     - any changes to or additions to the covenants described below or contained
       in the Indentures; and

     - any other terms of the Debt Securities.

SENIOR AND SUBORDINATED DEBT SECURITIES

     The Senior Debt Securities will rank equally in right of payment with all
of our other senior and unsubordinated debt. The Subordinated Debt Securities
will rank junior in right of payment to all of our senior debt. "Senior debt"
includes all notes or other unsecured evidences of indebtedness, including
guarantees given by us, for money borrowed by us, not expressed to be
subordinate or junior in right of payment to any of our other indebtedness.

     Each Indenture will allow us to issue Debt Securities up to the principal
amount that we authorize. Moreover, any Indenture relating to subordinated debt
(a "Subordinated Indenture") will not limit the amount of senior debt that we
may incur.

     Each Subordinated Indenture will provide that no payment of principal,
interest and any premium on the applicable Subordinated Debt Securities may be
made if:

     - we or our property are involved in any voluntary or involuntary
       liquidation or bankruptcy;

     - we fail to pay the principal, interest, any premium or any other amounts
       on any Senior Debt when due; or

     - we have a nonpayment default on any Senior Debt that imposes a payment
       blockage on the Subordinated Debt Securities for a maximum of 179 days at
       any one time.

SUBSIDIARY GUARANTEES

     We conduct our operations through our subsidiaries. The Indentures will
require our subsidiaries that guarantee our long-term debt to guarantee, as
"guarantors," any series of Debt Securities on an equal basis. In particular,
the Indentures will require those subsidiaries who are guarantors or borrowers
under our credit agreement to equally guarantee any Debt Securities.

     Initially, we expect that all of our domestic subsidiaries will be
guarantors of any series of Debt Securities. Each guarantor is obligated under
its guarantee only up to an amount that will not constitute a fraudulent
conveyance or fraudulent transfer under federal, state or foreign law. We do not
expect that any of our foreign subsidiaries that will be guarantors of any
series of Debt Securities. The debt of these non-guarantor subsidiaries, and any
future debt incurred by any of them, effectively will be senior to any series of
Debt Securities. Holders of Debt Securities will effectively have a junior
position to claims of creditors and preferred stockholders of our subsidiaries
who are not guarantors.

CERTAIN COVENANTS

     Under the Indentures, we will agree that, at any time Debt Securities are
outstanding thereunder, we will:

     - pay the principal, interest and premium on the Debt Securities when due;

     - maintain a place of payment for the Debt Securities;

                                        7
<PAGE>   12

     - deliver a report to the applicable trustee at the end of each fiscal year
       reviewing our obligations under the applicable Indenture; and

     - deposit sufficient funds with any payment agent on or before the due date
       for any principal, premium or interest payment.

     We have also agreed to the following covenants relating to limitations on
liens, requirements with respect to consolidations, mergers and assets sales and
restrictions on sale-and-leaseback transactions.

  Limitations on Liens

     The Indentures will provide that we will not, nor will we permit any of our
subsidiaries to, create, assume, incur or otherwise cause or suffer to exist or
become effective any lien of any kind securing indebtedness or trade payables on
any of our, or their, property or assets, whether owned or leased or hereafter
acquired, unless all payments due under the Debt Securities and the applicable
Indenture are secured on an equal and ratable basis with the obligation so
secured until such time as the obligations are no longer secured by a lien,
except for Permitted Liens.

     By "Permitted Liens", we mean:

     - liens on our assets or the assets of any of our guarantor securing
       indebtedness under any credit facility that are permitted to be incurred
       by the terms of the applicable Indenture;

     - liens in favor of us or any guarantor;

     - liens on property of a an entity existing at the time such entity is
       merged with or into or consolidated with us or any of our subsidiaries;
       provided, however, that such liens were in existence prior to the
       contemplation of such merger or consolidation and do not extend to any
       assets other than those of the merged entity;

     - liens on property existing at the time of acquisition thereof by us or
       any of our subsidiaries; provided, however, that such liens were in
       existence prior to the contemplation of such acquisition;

     - liens to secure the performance of statutory obligations, surety or
       appeal bonds, performance bonds, workers' compensation, easements or
       rights-of-way or other obligations of a like nature incurred in the
       ordinary course of business which do not materially interfere with our
       ability to perform our obligations under the applicable Indenture and
       Debt Securities;

     - liens to secure indebtedness covering only the assets acquired with such
       indebtedness;

     - liens existing on the issue date of the applicable series of Debt
       Securities;

     - liens for taxes, assessments or governmental charges or claims that are
       not yet delinquent or that are being contested in good faith by
       appropriate proceedings promptly instituted and diligently concluded;
       provided, however, that any reserve or other appropriate provision as
       shall be required in conformity with GAAP shall have been made therefor;
       and

     - liens incurred by us in our ordinary course of business or any our
       subsidiaries with respect to obligations that do not exceed a specified
       dollar amount at any one time outstanding that do not in the aggregate
       materially detract from the value of the property or materially impair
       the use thereof in the operation of our business.

  Consolidation, Merger or Asset Sale

     Each Indenture generally will allow us to consolidate or merge with a
domestic corporation. They also will allow us to sell, lease or transfer all or
substantially all of our property and assets to a domestic corporation. If this
happens, the remaining or acquiring corporation must assume all of our
responsibilities and liabilities under the Indentures including the payment of
all amounts due on any outstanding series of Debt Securities and performance of
the covenants in the Indentures.

                                        8
<PAGE>   13

     However, we will only consolidate or merge with or into any other
corporation or sell, lease or transfer all or substantially all of our assets
according to the terms and conditions of the Indentures, which include the
following requirements:

     - the remaining or acquiring corporation is organized under the laws of the
       United States, any state or the District of Columbia;

     - the remaining or acquiring corporation assumes our obligations under the
       Indentures and any outstanding Debt Securities pursuant to agreements
       reasonably satisfactory to the applicable trustee;

     - immediately after giving effect to the transaction no Default or Event of
       Default exists; and

     - the remaining or acquiring corporation:

        - will have consolidated net worth (as defined in any supplemental
          indenture) immediately after the transaction equal to or greater than
          our consolidated net worth immediately prior to the transaction; and

        - will, on the date of such transaction after giving pro forma effect
          thereto and any related financing transactions as if the same had
          occurred at the beginning of the applicable four-quarter period, be
          permitted to incur at least $1.00 of additional indebtedness pursuant
          to any fixed charge coverage ratio test set forth in any supplemental
          indenture.

     The remaining or acquiring corporation will be substituted for us in the
Indentures with the same effect as if it had been an original party to the
Indentures. Thereafter, the successor may exercise our rights and powers under
the Indentures, in our name or in its own name. If we sell or transfer all or
substantially all of our assets, we will be released from all our liabilities
and obligations under any Indenture and under the Debt Securities. If we lease
all or substantially all of our assets, we will not be released from our
obligations under the Indentures.

  Restriction on Sale-and-Leaseback Transactions

     The Indentures will provide that we will not, and will not permit any of
our subsidiaries to, enter into any sale-and-leaseback transactions, unless:

     - We or our subsidiaries, as applicable, could have incurred indebtedness
       in an amount equal to the Attributable Debt with respect to such
       sale-and-leaseback transaction and incurred a lien to secure such
       indebtedness pursuant to the covenant described above under the caption
       "-- Limitation on Liens";

     - the gross cash proceeds of such sale-and-leaseback transaction are at
       least equal to the fair market value, as determined in good faith by our
       Board of Directors and set forth in an officers' certificate delivered to
       the applicable trustee, of the property that is the subject of such sale
       and leaseback transaction; and

     - the transfer of assets in the sale-and-leaseback transaction is permitted
       by, and we apply the proceeds of such transaction in compliance with, the
       covenant described above under the caption "-- Consolidation, Merger or
       Asset Sale".

     "Attributable Debt", when used with respect to any to any
sale-and-leaseback transaction, means, as at the time of determination, the
present value (discounted at the rate set forth or implicit in the terms of the
lease included in such transaction) of the total obligations of the lessee for
rental payments (other than amounts required to be paid on account of property
taxes, maintenance, repairs, insurance, assessments, utilities, operating and
labor costs and other items that do not constitute payments for property rights)
during the remaining term of the lease included in such sale-and-leaseback
transaction (including any period for which such lease has been extended). In
the case of any lease that is terminable by the lessee upon the payment of a
penalty or other termination payment, such amount shall be the lesser of the
amount determined assuming termination upon the first date such lease may be
terminated (in
                                        9
<PAGE>   14

which case the amount shall also include the amount of the penalty or
termination payment, but no rent shall be considered as required to be paid
under such lease subsequent to the first date upon which it may be so
terminated) or the amount determined assuming no such termination.

  Additional Covenants

     Any series of Debt Securities may provide in the applicable Indenture for
additional covenants which may restrict the operations and activities of the
Company, including covenants which restrict our ability to make certain payments
or to incur additional indebtedness.

CHANGE OF CONTROL

     Any series of Debt Securities may provide in the Indenture that holders of
that series of Debt Securities may require us to repurchase such Securities at a
specified price upon the occurrence of a change of control of the Company (as
defined in the applicable Indenture).

EVENTS OF DEFAULT AND REMEDIES

     "Event of Default" when used in an Indenture, will mean any of the
following:

     - our failure to pay the principal of, or any premium on, any Debt Security
       when due; or

     - our failure to pay interest on any Debt Security for 30 days; or

     - our failure to perform any other covenant in the Indenture that continues
       for 60 days after being given written notice; or

     - our default under any mortgage, indenture or instrument under which there
       may be issued or by which there may be secured or evidenced any
       indebtedness for money borrowed by us or any of our subsidiaries, which
       default (a) is caused by a failure to pay principal of that indebtedness
       at final maturity or (b) results in the acceleration of that indebtedness
       before its express maturity and, in each case, the principal amount of
       all such indebtedness under which there has been a payment default or the
       maturity of which has been accelerated, aggregates in excess of a
       specified amount, where the default has not been cured or the
       acceleration has not been rescinded within five business days after the
       default or acceleration; or

     - our failure to pay final judgments aggregating in excess of a specified
       amount, which remain unpaid or undischarged for a period of 60 days; or

     - certain events involving our bankruptcy, insolvency or reorganization; or

     - any other Event of Default included in any Indenture.

     The trustee may withhold notice to the holders of Debt Securities of any
default (except in the payment of principal or interest) if it considers such
withholding of notice to be in the best interests of the holders.

     If an Event of Default for any series of Debt Securities occurs and
continues, the trustee or the holders of a specified percentage in aggregate
principal amount of the Debt Securities of the series may declare the entire
principal of all the Debt Securities of that series to be due and payable
immediately. If this happens, subject to certain conditions, the holders of a
majority of the aggregate principal amount of the Debt Securities of that series
can void the declaration.

     Other than its duties in case of a default, a trustee is not obligated to
exercise any of its rights or powers under any Indenture at the request, order
or direction of any holders, unless the holders offer the trustee reasonable
indemnity. If they provide this reasonable indemnification, the holders of a
majority in principal amount of any series of Debt Securities may direct the
time, method and place of conducting any proceeding or any remedy available to
the trustee, or exercising any power conferred upon the trustee, for any series
of Debt Securities.
                                       10
<PAGE>   15

MODIFICATION OF INDENTURES

     Generally, under each Indenture, we and the trustee will be permitted to
modify our rights and obligations, the guarantors' rights and obligations and
the rights of the holders under that Indenture with the consent of the holders
of a majority in aggregate principal amount of the outstanding Debt Securities
of each series affected by the modification, including consents obtained in
connection with a purchase of, or a tender offer for, a series of Debt
Securities. However, without the consent of each holder affected, no
modification may:

     - reduce principal amount of any series of Debt Securities;

     - reduce the rate of, or change the time for payment of interest of, any
       series of Debt Securities;

     - alter the ranking of a series of Debt Securities relative to other
       indebtedness of the Company;

     - waive a Default or Event of Default in the payment of principal of or
       premium, if any, or interest on a series of Debt Securities (except a
       rescission of acceleration by the holders of at least a majority in
       aggregate principal amount of such series of Debt Securities and a waiver
       of the payment default that resulted from such acceleration); or

     - make any change in the preceding modification, amendment and waiver
       provisions.

     Notwithstanding the preceding, without the consent of any holder of the
Debt Securities, we and the applicable trustee may amend or supplement an
Indenture:

     - to cure any ambiguity, defect or inconsistency;

     - to provide for the assumption of our obligations to holders of Debt
       Securities in the case of a merger or consolidation or sale of all or
       substantially all of our assets;

     - to make any change that would provide any additional rights or benefits
       to the holders of Debt Securities or that does not adversely affect the
       legal rights under the applicable Indenture of any such holder;

     - to provide for a successor trustee;

     - to comply with requirements of the Securities and Exchange Commission in
       order to effect or maintain the qualification of the Indenture under the
       Trust Indenture Act; or

     - to add terms and provisions relating to a specific series of Debt
       Securities.

DISCHARGING OUR OBLIGATIONS; DEFEASANCE

     We may choose to either discharge all of our obligations and the
obligations of the guarantors under any series of Debt Securities in a legal
defeasance, or to release ourselves and the guarantors from the covenant
restrictions with respect to a series of Debt Securities in a covenant
defeasance. We may do so at any time on the 91st day after we irrevocably
deposit with the applicable trustee cash or government Securities in an amount
sufficient to pay the principal, interest, any premium and any other sums to the
stated maturity date or a redemption date for that series of Debt Securities. If
we choose this option, the holders of that series of Debt Securities will not be
entitled to the benefits of the applicable Indenture, except for:

     - registration of transfer and exchange of Debt Securities;

     - replacement of lost, stolen or mutilated Debt Securities;

     - conversion or exchange of Debt Securities;

     - sinking fund payments; and

     - the receipt of principal and interest on the original stated due dates or
       specified redemption dates.

                                       11
<PAGE>   16

     We may discharge our obligations under an Indenture or release ourselves
from covenant restrictions only if we meet certain requirements. Among other
things, we must deliver to the applicable trustee an opinion of counsel that the
discharge will not result in the holders of that series of Debt Securities
having to recognize taxable income or loss or subject them to different tax
treatment. In the case of legal defeasance, this opinion must be based on a
letter ruling from the Internal Revenue Service or a change in federal tax law.
In addition, no Default or Event of Default may have occurred and be continuing
at the time of such deposit, and the discharge may not result in the breach or
violation of any material agreement to which we are a party.

REGISTRATION OF NOTES; MINIMUM DENOMINATIONS

     We may issue Debt Securities of a series in registered, bearer, coupon or
global form. Debt Securities will be issued in registered form in amounts of
$1,000 each or multiples of $1,000.

NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS

     No director, officer, employee, incorporator or stockholder of the Company
or any guarantor, as such, shall have any liability for any of our obligations
or obligations of the guarantors under the Debt Securities, the Indentures or
the subsidiary guarantees, or for any claim based on, in respect of, or by
reason of, such obligations or their creation. Each holder of Debt Securities by
accepting such Debt Securities will waive and release all such liability. The
waiver and release will be part of the consideration for issuance of the Debt
Securities. The waiver may not be effective to waive liabilities under the
federal Securities laws.

PAYMENT AND TRANSFER

     We will pay principal and any premium and interest on Debt Securities at
the corporate trust office of the applicable trustee or at any other office or
agency maintained by us for such purpose. We may choose to make any interest
payments on a Debt Security:

     - by check mailed to the address of the holder of the Debt Security as it
       appears in the register for that series of Debt Securities; or

     - by wire transfer to an account maintained by the holder as specified in
       the register.

     We will make interest payments to the person in whose name the Debt
Security is registered at the closing of business on the days specified in the
applicable Indenture.

     Fully registered Debt Securities may be transferred or exchanged at the
corporate trust office of the applicable trustee or at any other office or
agency maintained by us for such purposes, without the payment of any service
charge except for any tax or governmental charge.

BOOK ENTRY, DELIVERY AND FORM

     The Debt Securities of a series may be issued in whole or in part in the
form of one or more global certificates that will be deposited with a depositary
identified in a prospectus supplement.

     Unless otherwise stated in any prospectus supplement, The Depository Trust
Company, New York, New York ("DTC") will act as depositary. Book-entry notes of
a series will be issued in the form of a global note that will be deposited with
DTC. This means that we will not issue certificates to each holder. One global
note will be issued to DTC who will keep a computerized record of its
participants (for example, your broker) whose clients have purchased the notes.
The participant will then keep a record of its clients who purchased the notes.
Unless it is exchanged in whole or in part for a certificate note, a global note
may not be transferred; except that DTC, its nominees and their successors may
transfer a global note as a whole to one another.

                                       12
<PAGE>   17

     Beneficial interests in global notes will be shown on, and transfers of
global notes will be made only through, records maintained by DTC and its
participants.

     DTC has provided us the following information: DTC is a limited-purpose
trust company organized under the New York Banking Law, a "banking organization"
within the meaning of the New York Banking Law, a member of the United States
Federal Reserve System, a "clearing corporation" within the meaning of the New
York Uniform Commercial Code and a "clearing agency" registered under the
provisions of Section 17A of the Securities Exchange Act of 1934. DTC holds
Securities that its participants ("Direct Participants") deposit with DTC. DTC
also records the settlement among Direct Participants of Securities
transactions, such as transfers and pledges, in deposited Securities through
computerized records for Direct Participant's accounts. This eliminates the need
to exchange certificates. Direct Participants include Securities brokers and
dealers, banks, trust companies, clearing corporations and certain other
organizations.

     DTC's book-entry system is also used by other organizations such as trust
companies that work through a Direct Participant. The rules that apply to DTC
and its participants are on file with the SEC.

     DTC is owned by a number of its Direct Participants and by the New York
Stock Exchange, Inc., The American Stock Exchange, Inc. and the National
Association of Securities Dealers, Inc.

     We will wire principal and interest payments to DTC's nominee. We and the
trustee will treat DTC's nominee as the owner of the global notes for all
purposes. Accordingly, we, the trustee and any paying agent will have no direct
responsibility or liability to pay amounts due on the global notes to owners of
beneficial interests in the global notes.

     It is DTC's current practice, upon receipt of any payment of principal or
interest, to credit Direct Participants' accounts on the payment date according
to their respective holdings of beneficial interests in the global notes as
shown on DTC's records. In addition, it is DTC's current practice to assign any
consenting or voting rights to Direct Participants whose accounts are credited
with notes on a record date, by using an omnibus proxy. Payments by participants
to owners of beneficial interests in the global notes, and voting by
participants, will be governed by the customary practices between the
participants and owners of beneficial interests, as is the case with notes held
for the account of customers registered in "street name." However, payments will
be the responsibility of the participants and not of DTC, the trustee or us.

     Notes represented by a global note will be exchangeable for certificate
notes with the same terms in authorized denominations only if:

     - DTC notifies us that it is unwilling or unable to continue as depositary
       or if DTC ceases to be a clearing agency registered under applicable law
       and a successor depositary is not appointed by us within 90 days; or

     - we determine not to require all of the notes of a series to be
       represented by a global note and notify the trustee of our decision.

THE TRUSTEE

  Resignation or Removal of Trustee

     Under provisions of the Indentures and the Trust Indenture Act of 1939, as
amended, governing trustee conflicts of interest, any uncured Event of Default
with respect to any series of Debt Securities will force the trustee to resign
as trustee under either the Subordinated Indenture or the Senior Indenture. Any
resignation will require the appointment of a successor trustee under the
applicable Indenture in accordance with the terms and conditions of that
Indenture. The trustee may resign or be removed by us with respect to one or
more series of Debt Securities and a successor trustee may be appointed to act
with respect to any such series. The holders of a majority in aggregate
principal amount of the Debt Securities of any series may remove the trustee
with respect to the Debt Securities of such series.

                                       13
<PAGE>   18

  Limitations on Trustee if it is a Creditor of the Company

     Each Indenture will contain limitations on the right of the trustee
thereunder, in the event that it becomes a creditor of the Company, to obtain
payment of claims in certain cases, or to realize on certain property received
in respect of any such claim as security or otherwise.

  Annual Trustee Report to Holders of Debt Securities

     The trustee will be required to submit an annual report to the holders of a
series of Debt Securities regarding, among other things, the trustee's
eligibility to serve as such, the priority of the trustee's claims regarding
certain advances made by it, and any action taken by the trustee materially
affecting the Debt Securities.

  Certificates and Opinions to Be Furnished to Trustee

     Each Indenture will provide that, in addition to other certificates or
opinions that may be specifically required by other provisions of an Indenture,
every application by us for action by the trustee shall be accompanied by a
certificate of certain of our officers and an opinion of counsel (who may be our
counsel) stating that, in the opinion of the signers, all conditions precedent
to such action have been complied with by us.

                DESCRIPTION OF COMMON STOCK AND PREFERRED STOCK

     Our authorized capital stock consists of 300 million shares of our common
stock and 10 million shares of preferred stock, par value $.01 per share, of
which, approximately 109.0 million shares of our common stock are issued and
outstanding. No shares of our preferred stock are issued or outstanding (unless
indicated otherwise in a prospectus supplement). All of the shares of our common
stock issued and outstanding have been validly issued and are fully paid and
nonassessable.

COMMON STOCK

  Voting Rights

     Holders of our common stock will be entitled to one vote for each share on
all matters voted on by stockholders. Our common stock will possess all voting
power of Grant Prideco, except as otherwise required by law or provided in any
resolution adopted by our board designating any series of our preferred stock.
The shares of our common stock will not have cumulative voting rights.

     Although the holders of our common stock are generally entitled to vote for
the approval of amendments to our certificate of incorporation, the voting
rights of the holders of our common stock are limited with respect to certain
amendments to our certificate of incorporation that affect only the holders of
our preferred stock. Specifically, subject to the rights of any outstanding
shares of any series of our preferred stock, our certificate of incorporation
may be amended from time to time in any manner that would solely modify or
change the relative powers, preferences and rights and the qualifications or
restrictions of any issued shares of any series of our preferred stock then
outstanding with the only required vote or consent for approval of such
amendment being the affirmative vote or consent of the holders of a majority of
the outstanding shares of the series of our preferred stock so affected,
provided that the powers, preferences and rights and the qualifications and
limitations or restrictions of such series after giving effect to such amendment
are no greater than the powers, preferences and rights and qualifications and
limitations or restrictions permitted to be fixed and determined by the board of
directors with respect to the establishment of any new series of shares of our
preferred stock pursuant to the authority vested in the board of directors as to
such matters.

                                       14
<PAGE>   19

  Dividend Rights

     Subject to any preferential or other rights of any outstanding series of
our preferred stock that our board may designate, and subject to contractual
restrictions contained in our debt agreements, holders of our common stock will
be entitled to such dividends as may be declared from time to time by our board
from funds legally available therefor.

  Liquidation Rights and Other Provisions

     Subject to the prior rights of creditors and the holders of any of our
preferred stock that may be outstanding from time to time, the holders of our
common stock are entitled in any liquidation, dissolution or winding up to share
pro rata in the distribution of all remaining assets.

     Our common stock is not liable for any calls or assessments and is not
convertible into any other Securities. Our certificate of incorporation will
provide that the private property of the stockholders shall not be subject to
the payment of corporate debts. There are no redemption or sinking fund
provisions applicable to our common stock.

  Transfer Agent And Registrar

     The registrar and transfer agent of our common stock is American Stock
Transfer & Trust Company.

PREFERRED STOCK

     Under our Certificate of Incorporation, the Board of Directors of Grant
Prideco is authorized, without further stockholder action, to issue from time to
time up to 10,000,000 shares of Preferred Stock and to fix and determine voting
powers, designations, preferences and relative, participating, optional or other
special rights and qualifications, limitations or restrictions of any series of
Preferred Stock, including, without limitation, any voting rights, any dividends
payable and any right of the shares of that series to convert into or be
exchanged for other Securities of Grant Prideco (provided, however, that any
Securities issuable upon conversion or exchange of Preferred Stock will be
subject to registration under the Securities Act or an applicable exemption
therefrom). The Board of Directors of Grant Prideco, without stockholder
approval, could authorize the issuance of Preferred Stock with voting,
conversion and other rights that could adversely affect the voting power (if
any) and other rights of other series of the Preferred Stock or of the Common
Stock. As of the date of this prospectus we have no Preferred Stock outstanding.

  Specific Terms of Each Series of Preferred Stock in a Prospectus Supplement

     The following describes general terms and provisions of the Preferred Stock
to which any prospectus supplement may relate. Other terms, and the particular
terms of a specific series of Preferred Stock (which differ from the terms
described below), will be described in the prospectus supplement relating to
that series. The terms of each series of Preferred Stock will be governed by our
Certificate of Incorporation (as amended from time to time) and the certificate
of designations relating to that series of Preferred Stock (the "Certificate of
Designations"). The Certificate of Incorporation and any Certificates of
Designations are not restated in their entirety below and will not be restated
in their entirety in a prospectus supplement. We will file a Certificate of
Designations as an exhibit to the registration statement of which this
prospectus forms a part (or as an exhibit to a Current Report on Form 8-K)
before we issue that series of the Preferred Stock. You should read our
Certificate of Incorporation and any applicable Certificate of Designations,
because they, and not this description, control the rights of holders of
Preferred Stock.

     The Preferred Stock will have the dividend, liquidation, redemption and
voting rights set forth below, unless otherwise provided in the prospectus
supplement relating to a particular series of Preferred Stock.

                                       15
<PAGE>   20

     The applicable prospectus supplement will describe:

     - the designation and the number of shares offered;

     - the amount of liquidation preference per share;

     - the price at which that Preferred Stock will be issued;

     - the dividend rate (or method of calculation), if any, the dates on which
       dividends will be payable, whether dividends will be cumulative or
       noncumulative and, if cumulative, the dates from which dividends will
       begin to cumulate;

     - any redemption or sinking fund provisions;

     - the terms of any rights to convert or exchange the Preferred Stock into
       other Securities of Grant Prideco;

     - whether we have elected to offer Depositary Shares (as defined below);
       and

     - any additional voting, dividend, liquidation, redemption, sinking fund
       and other rights, preferences, privileges, limitations and restrictions.

  Voting Rights

     The holders of Preferred Stock of a series offered hereby will not have any
voting rights, except as indicated in the applicable prospectus supplement or as
required by applicable law.

  Dividend Rights

     Unless otherwise set forth in the applicable prospectus supplement, holders
of shares of each series of the Preferred Stock will be entitled to receive,
when, as and if declared by the Board of Directors of Grant Prideco out of funds
legally available therefor, cash dividends at such rates and on such dates as
are set forth in the prospectus supplement relating to such series of Preferred
Stock. Different series of Preferred Stock may be entitled to dividends at
different rates or based upon different methods of determination. The dividend
rate may be fixed or variable or both. Each dividend will be payable to the
holders of record as they appear on the stock books of Grant Prideco, on the
record dates fixed by the Board of Directors of Grant Prideco or a duly
authorized committee thereof. Dividends on any series of the Preferred Stock may
be cumulative or noncumulative, as provided in the related prospectus
supplement.

  Liquidation Rights

     In the event of any voluntary or involuntary liquidation, dissolution or
winding up of Grant Prideco, the holders of shares of each series of Preferred
Stock will be entitled to receive liquidating distributions in the amount set
forth in the prospectus supplement relating to that series of Preferred Stock,
out of assets of Grant Prideco available for distribution to stockholders,
before any distribution of assets is made to holders of Common Stock or any
other class of stock ranking junior to that series of Preferred Stock upon
liquidation.

     Because we are a holding company, our rights and the rights of holders of
our Securities, including the holders of Preferred Stock, to participate in the
distribution of assets of any of our subsidiaries on the subsidiary's
liquidation or recapitalization will be subject to the prior claims of the
subsidiary's creditors and preferred stockholders, except to the extent that we
may itself be a creditor with recognized claims against the subsidiary or a
holder of preferred stock of the subsidiary. The Preferred Stock will rank prior
to the Common Stock with respect to dividend rights and rights upon winding up
and dissolution of Grant Prideco.

     The Preferred Stock will be issued in one or more series. The holders of
Preferred Stock will have no preemptive rights. Preferred Stock will be fully
paid and nonassessable when issued upon full payment of the purchase price
therefor. Unless otherwise specified in the prospectus supplement relating to a
particular

                                       16
<PAGE>   21

series of Preferred Stock, each series of Preferred Stock offered hereby will
rank on a parity as to dividends and liquidation rights in all respects with
each other series of Preferred Stock. The prospectus supplement will contain, if
applicable, a description of material United States federal income tax
consequences relating to the purchase and ownership of shares of the series of
Preferred Stock offered by the prospectus supplement.

  Redemption

     One or more series of the Preferred Stock may be redeemable, in whole or in
part, at the option of Grant Prideco, and may be subject to mandatory redemption
pursuant to a sinking fund or otherwise, in each case upon terms, at the times
and at the redemption prices set forth in the applicable prospectus supplement.

  Conversion and Exchange

     The terms, if any, on which shares of any series of Preferred Stock will be
convertible into or exchangeable for other Securities of Grant Prideco will be
set forth in the applicable prospectus supplement (however, any Securities
issuable upon conversion or exchange of Preferred Stock will be subject to
registration under the Securities Act or an applicable exemption therefrom). The
conversion or exchange terms may include provisions for conversion or exchange,
either mandatory, at the option of the holder, or at our option, in which case
the number of other Securities of Grant Prideco to be received by the holders of
that series of Preferred Stock would be calculated as of a time and in the
manner stated in the prospectus supplement.

  Transfer Agent and Registrar

     The transfer agent, registrar and dividend disbursement agent for the
Preferred Stock will be designated in the applicable prospectus supplement. The
registrar for shares of Preferred Stock will send to stockholders notices of any
meetings at which holders of the applicable series of Preferred Stock will have
the right to elect directors of Grant Prideco or to vote on any other matter.

NO PREEMPTIVE RIGHTS

     No holder of any stock of Grant Prideco of any class authorized at the
distribution date will have any preemptive right to subscribe to any Securities
of Grant Prideco of any kind or class.

BUSINESS COMBINATIONS WITH INTERESTED STOCKHOLDERS

     As a Delaware corporation, we are subject to Section 203 of the Delaware
General Corporation Law. In general, Section 203 prevents an "interested
stockholder" (defined generally as a person owning 15% or more of a
corporation's outstanding voting stock) from engaging in a "business
combination" (as defined) with a Delaware corporation for three years following
the time such person became an interested stockholder unless:

     - before such person became an interested stockholder, the board of
       directors of the corporation approved the transaction in which the
       interested stockholder became an interested stockholder or approved the
       business combination;

     - upon consummation of the transaction that resulted in the stockholder
       becoming an interested stockholder, the interested stockholder owns at
       least 85% of the voting stock of the corporation outstanding at the time
       the transaction commenced (excluding stock held by directors who are also
       officers of the corporation and by employee stock plans that do not
       provide employees with the rights to determine confidentially whether
       shares held subject to the plan will be tendered in a tender or exchange
       offer); or

     - following the transaction in which such person became an interested
       stockholder, the business combination is approved by the board of
       directors of the corporation and authorized at a meeting of
                                       17
<PAGE>   22

       stockholders by the affirmative vote of the holders of two-thirds of the
       outstanding voting stock of the corporation not owned by the interested
       stockholder.

     Under Section 203, the restrictions described above also do not apply to
certain business combinations proposed by an interested stockholder following
the announcement or notification of one of certain extraordinary transactions
involving the corporation and a person who had not been an interested
stockholder during the previous three years or who became an interested
stockholder with the approval of a majority of the corporation's directors, if
such extraordinary transaction is approved or not opposed by a majority of the
directors who were directors prior to any person becoming an interested
stockholder during the previous three years or were recommended for election or
elected to succeed such directors by a majority of such directors.

NOMINATION OF DIRECTORS

     Our bylaws establish an advance notice procedure with regard to the
nomination, other than by or at the direction of the board or a committee
thereof, of candidates for election as directors.

     This nomination procedure requires that a stockholder give advance written
notice, in proper form, of a planned nomination for the board to the Secretary
of Grant Prideco. The requirements as to the form and timing of that notice,
which are specified in our bylaws, are not inconsistent with the requirements of
the Securities Exchange Act of 1934 for a stockholder proposal. If a person is
not nominated in accordance with this nomination procedure, that person will not
be eligible for election as a director.

     Although our bylaws do not give the board any power to approve or
disapprove stockholder nominations for the election of directors, our bylaws may
have the effect of precluding a nomination for the election of directors at a
particular meeting if the proper procedures are not followed and may discourage
a third party from soliciting proxies to elect its own slate of directors or
otherwise attempting to obtain control of Grant Prideco, even if that
solicitation or attempt might be beneficial to us and our stockholders.

DEPOSITARY SHARES

  General

     We may offer receipts for fractional interests ("Depositary Shares") in
Preferred Stock, rather than full shares of Preferred Stock. If we do so,
receipts ("Depositary Receipts") for Depositary Shares, each of which will
represent a fraction (which will be set forth in the prospectus supplement
relating to the applicable series of Preferred Stock) of a share of a particular
series of Preferred Stock, will be issued as described below.

     The shares of any series of Preferred Stock represented by Depositary
Shares will be deposited under a Deposit Agreement between Grant Prideco and a
Depositary to be named by Grant Prideco in the applicable prospectus supplement.
Subject to the terms of the Deposit Agreement, each owner of a Depositary Share
will be entitled, in proportion to the applicable fraction of a share of
Preferred Stock represented by that Depositary Share, to all of the rights and
preferences of the Preferred Stock represented thereby (including dividend,
voting, redemption, subscription and liquidation rights). The following summary
of certain provisions of the Deposit Agreement does not purport to be complete
and is subject to, and is qualified in its entirety by reference to, all of the
provisions of the Deposit Agreement, including the definitions therein of
certain terms. Copies of the forms of Deposit Agreement and Depositary Receipt
are incorporated by reference as exhibits to the Registration Statement of which
this prospectus is a part, and the following summary is qualified in its
entirety by reference to those exhibits.

                                       18
<PAGE>   23

  Dividends and Other Distributions

     The Depositary will distribute all cash dividends or other cash
distributions received in respect of the applicable series of Preferred Stock to
the record holders of Depositary Shares relating to that series in proportion to
the amount of those Depositary Shares owned by the holders.

     In the event of a distribution other than in cash, then the Depositary will
distribute property received by it to the record holders of Depositary Shares in
an equitable manner, unless Grant Prideco, after consulting with the Depositary,
determines that it is not feasible to make the distribution, in which case the
Depositary may sell the distributed property and distribute the net proceeds
from the sale to the holders.

  Redemption of Depositary Shares

     If a series of Preferred Stock represented by Depositary Shares is subject
to redemption, the Depositary Shares will be redeemed from the proceeds received
by the Depositary resulting from any redemption of any shares of that series of
Preferred Stock held by the Depositary. The redemption price per Depositary
Share will equal the applicable fraction of the redemption price per share
payable with respect to that series of Preferred Stock. Whenever Grant Prideco
redeems shares of Preferred Stock held by the Depositary, the Depositary will
redeem, as of the same redemption date, the number of Depositary Shares
representing shares of Preferred Stock so redeemed. If fewer than all of the
Depositary Shares are to be redeemed, then the Depositary Shares to be redeemed
will be selected by lot, pro rata or by another equitable method.

  Withdrawal of Preferred Stock

     Any holder of Depositary Shares may receive, upon surrender of the
corresponding Depositary Receipts to the Depositary, the number of whole shares
of the related series of Preferred Stock and any money or other property
represented by the surrendered Depositary Receipts. Holders of Depositary Shares
that surrender their Depositary Receipts will be entitled to receive whole
shares of Preferred Stock on the basis set forth in the related prospectus
supplement for the applicable series of Preferred Stock, but holders of whole
shares of that series of Preferred Stock will not be entitled to subsequently
deposit those shares of Preferred Stock under the Deposit Agreement or to
receive Depositary Receipts therefor. If the Depositary Shares surrendered by a
holder in connection with a withdrawal exceed the number of Depositary Shares
that represent the number of whole shares of Preferred Stock to be withdrawn,
then the Depositary will deliver to that holder at the same time a new
Depositary Receipt evidencing the excess number of Depositary Shares.

  Voting the Preferred Stock

     Upon receipt of a notice of any meeting at which the holders of a series of
Preferred Stock are entitled to vote, the Depositary will mail the information
contained in the notice to the record holders of the Depositary Shares relating
to that series of Preferred Stock. Each record holder of the Depositary Shares
on the record date (which will be the same date as the record date for the
Preferred Stock) will be entitled to instruct the Depositary to exercise the
voting rights pertaining to the shares of Preferred Stock represented by that
holder's Depositary Shares. The Depositary will endeavor, insofar as
practicable, to vote the amount of the Preferred Stock represented by those
Depositary Shares in accordance with the holder's instructions, and Grant
Prideco will take all reasonable action that the Depositary may deem necessary
in order to enable the Depositary to do so. The Depositary will abstain from
voting shares of the Preferred Stock to the extent that it does not receive
specific instructions from the holder of Depositary Shares representing those
shares of Preferred Stock.

  Amendment and Termination of Deposit Agreement

     The form of Depositary Receipt evidencing the Depositary Shares and any
provision of the Deposit Agreement may at any time be amended by agreement
between Grant Prideco and the Depositary.
                                       19
<PAGE>   24

However, any amendment that imposes any fees, taxes or other charges payable by
holders of Depositary Receipts (other than taxes and other governmental charges,
fees and other expenses payable by such holders as stated under "-- Depositary
Shares -- Charges of Depositary"), or that otherwise prejudices any substantial
existing right of holders of Depositary Receipts, will not affect outstanding
Depositary Receipts until 90 days after notice of the amendment has been mailed
to the record holders of outstanding Depositary Receipts. Every holder of
Depositary Receipts at the time the amendment becomes effective will be deemed
to consent and agree to the amendment and to be bound by the Deposit Agreement,
as so amended. No amendment may impair the right of any owner of Depositary
Shares to receive shares of the Preferred Stock and any money or other property
represented thereby, subject to the conditions specified in the Deposit
Agreement, upon surrender of the Depositary Receipts evidencing such Depositary
Shares, except in order to comply with mandatory provisions of applicable law.

     Whenever so directed by Grant Prideco, the Depositary will terminate the
Deposit Agreement by mailing notice of termination to the record holders of all
Depositary Receipts then outstanding at least 30 days before the termination
date stated in the notice. The Depositary also may terminate the Deposit
Agreement if 45 days have expired after the Depositary delivered to Grant
Prideco a written notice of its election to resign and a successor depositary
has not been appointed and accepted its appointment. If any Depositary Receipts
remain outstanding after the date of termination, the Depositary will
discontinue the transfer of Depositary Receipts, will suspend the distribution
of dividends to the holders of Depositary Receipts, and will not give any
further notices (other than notice of termination) or perform any further acts
under the Deposit Agreement, except that the Depositary will continue (1) to
collect dividends and any other distributions on the Preferred Stock and (2) to
deliver the Preferred Stock, together with the corresponding dividends and
distributions and the net proceeds of any sales of rights, preferences,
privileges or other property, without liability for interest thereon, in
exchange for Depositary Receipts surrendered. At any time after two years from
the date of termination, the Depositary may sell the Preferred Stock then held
by it at public or private sales, at such place or places and upon such terms as
it deems proper, and may hold the net proceeds of any sale, together with any
money and other property then held by it, without liability for interest
thereon, for the pro rata benefit of the holders of Depositary Receipts which
have not been surrendered.

  Resignation and Removal of Depositary

     The Depositary may resign at any time by delivering notice of its election
to do so to Grant Prideco, and Grant Prideco may at any time remove the
Depositary. Any resignation or removal will take effect upon the appointment of
a successor Depositary and its acceptance of such appointment. The successor
Depositary must be appointed within 45 days after delivery of the notice of
resignation or removal and must be a bank or trust company, or an affiliate of a
bank or trust company, having its principal office in the United States and
having a combined capital and surplus of at least $50,000,000.

  Charges of Depositary

     Grant Prideco will pay charges of the Depositary in connection with the
initial deposit of the Preferred Stock and issuance of Depositary Receipts, all
withdrawals of shares of Preferred Stock by owners of Depositary Shares, any
redemption of the deposited Preferred Stock and the distribution of information
to holders of the Depositary Receipts. Holders of Depositary Receipts will pay
other transfer and other taxes and governmental charges and any other charges
that are expressly provided in the Deposit Agreement to be at their expense.

  Miscellaneous

     The Depositary will forward to the holders of Depositary Receipts all
reports and communications from Grant Prideco that are delivered to the
Depositary and that Grant Prideco is required or otherwise determines to furnish
to the holders of the corresponding series of Preferred Stock.

                                       20
<PAGE>   25

     Neither the Depositary nor Grant Prideco will be liable if it is prevented
or delayed by law or any circumstance beyond its control in performing its
obligations under the Deposit Agreement. The obligations of the Depositary under
the Deposit Agreement are limited to performing its duties thereunder without
negligence or bad faith. The obligations of Grant Prideco under the Deposit
Agreement are limited to performing its duties thereunder in good faith. Neither
Grant Prideco nor the Depositary will be required to prosecute or defend any
legal proceeding regarding any Depositary Shares or Preferred Stock unless
satisfactory indemnity is furnished. Grant Prideco and the Depositary may rely
upon the advice of counsel or accountants, or upon information provided by
persons presenting Preferred Stock.

                            DESCRIPTION OF WARRANTS

     We may issue Warrants to purchase Debt Securities, Common Stock or
Preferred Stock (which may be represented by Depositary Shares). We may issue
Warrants independently or together with any other Securities and may attach them
to or separate them from other Securities. We will issue any Warrants under
separate Warrant Agreements to be entered into between us and a warrant agent
specified in the applicable prospectus supplement.

SPECIFIC TERMS OF EACH SERIES OF WARRANT IN A PROSPECTUS SUPPLEMENT

     The following describes general terms and provisions of the Warrants to
which any prospectus supplement may relate. Other terms, and the particular
terms of a specific series of Warrants (which differ from the terms described
below), will be described in the prospectus supplement relating to that series.
The terms of each series of Warrants will be governed by a Warrant Agreement
(each a "Warrant Agreement") that we will enter into with a warrant agent. No
Warrant Agreement is restated in its entirety below, and the Warrant Agreement
relating to any specific series of Warrants will not be restated in its entirety
in a prospectus supplement. We will file a Warrant Agreement relating to each
series of Warrants as an exhibit to the registration statement of which this
prospectus forms a part (or as an exhibit to a Current Report on Form 8-K)
before we sell those Warrants. You should read that Warrant Agreement, because
it, and not this description, controls the rights of holders of the applicable
Warrants.

     The Warrants will be denominated in U.S. dollars or in such foreign
currency, currency unit or composite currency as indicated in the applicable
prospectus supplement.

     The applicable prospectus supplement will describe the terms of any series
of Warrants in respect of which this prospectus is being delivered, including,
where applicable, the following:

     - the title of the Warrants;

     - the aggregate number of the Warrants;

     - the price or prices for which the Warrants will be issued;

     - the currency, currency unit or composite currency in which the price for
       the Warrants will be payable;

     - the designation, number and terms of the Debt Securities, Common Stock or
       Preferred Stock purchasable upon exercise of the Warrants, and procedures
       pursuant to which such numbers may be adjusted;

     - the designation and terms of the Debt Securities, Common Stock or
       Preferred Stock, if any, with which the Warrants are issued and the
       number of Warrants issued with each such Security;

     - the date, if any, on and after which the Warrants and the related
       underlying Security will be separately transferable;

     - the exercise price or prices at which the Debt Securities, Common Stock
       or Preferred Stock purchasable upon exercise of the Warrants may be
       purchased, or provisions for determining the exercise price or prices,
       procedures pursuant to which the exercise price or prices may be
       adjusted,

                                       21
<PAGE>   26

       and (if not U.S. dollars) the foreign currency, currency unit or
       composite currency in which the exercise price or prices are denominated;

     - the date on which the right to exercise the Warrants will commence and
       the date on which that right will expire;

     - whether the Warrants will be issued in bearer form;

     - the minimum or maximum amount of Warrants that may be exercised at any
       one time;

     - information with respect to book-entry procedures, if any;

     - a discussion of certain United States federal income tax considerations;
       and

     - any other terms of the Warrants, including terms, procedures and
       limitations relating to the

     - transferability, exchange and exercise of the Warrants.

     Until they exercise their Warrants, holders of Warrants will not have any
of the rights of holders of the Securities purchasable upon exercise, and will
not be entitled to

     - receive payments of principal of (or premium, if any) or interest, if
       any, on any Debt Securities purchasable upon exercise,

     - receive dividend payments, if any, with respect to any underlying
       Securities or

     - exercise the voting rights of any Common Stock or Preferred Stock
       purchasable upon exercise.

EXERCISE OF WARRANTS

     Unless otherwise indicated in the applicable prospectus supplement relating
thereto, the Warrants will be issued in registered form. Each Warrant will
entitle its holder to purchase for cash the principal amount or number of
Securities of Grant Prideco at the exercise price set forth in, or determinable
from, the applicable prospectus supplement relating to the Warrants offered
thereby. Warrants may be exercised as described in the applicable prospectus
supplement at any time up to the close of business on the expiration date set
forth in the prospectus supplement. After the close of business on the
expiration date (or any later expiration date, if we extend the expiration
date), unexercised Warrants will become void.

     Upon receipt of payment and of the certificate evidencing a Warrant,
properly completed and duly executed, at the corporate trust office of the
warrant agent or any other office indicated in the applicable prospectus
supplement, we will, as soon as practicable, forward the Securities purchasable
upon such exercise. If less than all of the Warrants represented by a
surrendered Warrant certificate are exercised, a new Warrant certificate will be
issued for the remaining Warrants.

MODIFICATIONS

     We and the warrant agent may amend the Warrant Agreements and the terms of
the Warrants, without the consent of the holders of Warrants,

     - to cure any ambiguity, defect or inconsistency;

     - to provide for the assumption of our obligations to holders of Warrants
       in the case of a merger or consolidation or sale of all or substantially
       all of our assets;

     - to make any change that we deem necessary or desirable and that will not
       materially and adversely affect the interests of holders of outstanding
       Warrants; or

     - to provide for a successor warrant agent.

     We and the warrant agent also may modify or amend certain other terms of
the Warrant Agreements and the Warrants with the consent of the holders of a
majority in number of the then-outstanding

                                       22
<PAGE>   27

unexercised Warrants affected. However, no such modification or amendment may be
made without the consent of the affected holders if the amendment would

     - shorten the period of time during which the Warrants may be exercised;

     - otherwise materially and adversely affect the exercise rights of the
       holders of the Warrants; or

     - reduce the number of outstanding Warrants.

MERGER, CONSOLIDATION OR SALE OF ASSETS

     If at any time there occurs a merger of, consolidation of, or sale of
substantially all of the assets of, Grant Prideco, as a result of which
Securities underlying Warrants are converted into the right to receive stock,
Securities or other property, then each outstanding Warrant will thereafter only
be exercisable for the kind and amount of stock, Securities or other property
receivable upon the consummation of that transaction by a holder of the number
of Securities underlying the Warrant.

ENFORCEABILITY OF RIGHTS BY HOLDERS

     The warrant agent will act solely as our agent in connection with the
issuance and exercise of any Warrants. The warrant agent will have no duty or
responsibility in case of any default by Grant Prideco in the performance of its
obligations under the Warrant Agreements or the Warrant certificates. Each
holder of Warrants may, without the consent of the warrant agent, enforce by
appropriate legal action, on its own behalf, its right to exercise its Warrants.

                            SELLING SECURITYHOLDERS

     In addition to covering the offering of Securities by us, this prospectus
covers the offering for resale of Securities by Selling Securityholders. The
applicable prospectus supplement will set forth, with respect to each Selling
Stockholder,

     - the name of the Selling Stockholder,

     - the nature of any position, office or other materials relationship which
       the Selling Stockholder will have had within the prior three years with
       Grant Prideco or any of its predecessors or affiliates,

     - the type and amount of Securities owned by the Selling Stockholder prior
       to the offering,

     - the type and amount of Securities to be offered for the Selling
       Stockholder's account and

     - the amount and (if one percent or more) the percentage of Securities to
       be owned by the Selling Stockholder after completion of the offering.

     The Selling Securityholders may include or consist of, from time to time,
such underwriters and/or other persons with whom we may enter into standby
arrangements from time to time as described under "Plan of Distribution".

                                       23
<PAGE>   28

                              PLAN OF DISTRIBUTION

DISTRIBUTIONS BY GRANT PRIDECO

     We may sell Securities to one or more underwriters for public offering and
sale by them. We also may sell Securities directly to investors or to other
purchasers or through dealers or agents. We will name any underwriter, dealer or
agent involved in the offer and sale of the Securities in the applicable
prospectus supplement.

     In addition, we may from time to time, redeem, repurchase or tender for
some or all of our outstanding indebtedness. In that case, we may enter into an
agreement with one or more underwriters or other persons pursuant to which that
underwriter or person would agree to act as a "standby purchaser" and purchase
from us a number of shares of our common stock or other securities of Grant
Prideco as would be required to fund some or all of the applicable redemption,
repurchase or tender offer price. Alternatively, a standby purchaser may agree
to purchase directly any redeemed, repurchased or tendered indebtedness and
receive, as compensation, Securities issued by Grant Prideco. The agreement
might also provide that the standby purchaser would resell the Securities
received from Grant Prideco. In such case, the standby purchaser may be deemed
to be an underwriter and may be required to resell such Securities pursuant to a
prospectus supplement to this prospectus. The applicable terms of any such
agreement or arrangement, including terms relating to compensation and the
identity of any such standby purchaser, would be disclosed in a prospectus
supplement.

     We may distribute Securities from time to time in one or more transactions
at a fixed price or prices, which may be changed, or at market prices prevailing
at the time of sale, at prices related to those prevailing market prices or at
negotiated prices. We may sell common stock under this prospectus from time to
time in one or more transactions on the New York Stock Exchange or in negotiated
transactions or a combination of these methods.

     In connection with distributions of Securities, we may enter into hedging
transactions with broker-dealers through which those broker-dealers may sell
Securities registered hereunder in the course of hedging, through short sales,
the positions they assume with us.

     In connection with the sale of Securities, we may compensate underwriters,
dealers or agents or purchasers of Securities may compensate their agents, in
the form of discounts, concessions or commissions. Underwriters may sell
Securities to or through dealers, and the dealers may receive compensation in
the form of discounts, concessions or commissions from the underwriters and/or
commissions from the purchasers for whom they may act as agents. Underwriters,
dealers and agents that participate in a distribution of Securities may be
deemed to be underwriters, and any discounts or commissions received by them
from us (along with any profit on the resale of Securities by them) may be
deemed to be underwriting discounts and commissions under the Securities Act.
Any such underwriter, dealer or agent will be identified, and any such
compensation we pay, will be described in the applicable prospectus supplement.
Unless otherwise indicated in the applicable prospectus supplement, any agent
will be acting on a best efforts basis and any dealer will purchase Securities
as a principal, and may then resell those Securities at varying prices to be
determined by the dealer.

     We may enter into agreements to provide indemnification and contribution to
underwriters, dealers and agents who participate in a distribution of Securities
against certain civil liabilities, including liabilities under the Securities
Act, and to reimburse those underwriters, dealers and agents for certain
expenses.

     If we so indicated in the applicable prospectus supplement, we will
authorize agents and underwriters or dealers to solicit offers by certain
purchasers to purchase offered Securities from us, at the public offering price
set forth in the prospectus supplement, pursuant to delayed delivery contracts
providing for payment and delivery on a specified date in the future. These
contracts will be subject only to those conditions set forth in the prospectus
supplement, and the prospectus supplement will set forth the commission payable
for solicitation of the offers.

                                       24
<PAGE>   29

     Certain underwriters, dealers or agents and their associates may engage in
transactions with and perform services for us in the ordinary course of
business.

     The Securities may or may not be listed on a national Securities exchange
or a foreign Securities exchange (other than the common stock, which is listed
on the New York Stock Exchange). Any common stock sold pursuant to a prospectus
supplement will be listed on the New York Stock Exchange, subject to official
notice of issuance. Any underwriters to whom we sell Securities for public
offering and sale may make a market in those Securities, but the underwriters
will not be obligated to do so and may discontinue any market making activities
at any time without notice. We cannot assure you that there will be an active
trading market for any Securities.

DISTRIBUTION BY SELLING SECURITYHOLDERS

     Selling Securityholders may distribute Securities from time to time in one
or more transactions (which may involve block transactions) on the New York
Stock Exchange, in the over-the-counter market, in transactions otherwise than
on the New York Stock Exchange or in the over-the-counter market or in a
combination of any of these transactions. Selling Securityholders may sell
Securities at market prices prevailing at the time of sale, at prices related to
the prevailing market prices, at negotiated prices or at fixed prices. The
Selling Securityholders may from time to time offer their Securities through
underwriters, brokers, dealers or agents, who may receive compensation in the
form of underwriting discounts, commissions or concessions from the Selling
Securityholders and/or the purchasers of the Securities for whom they act as
agent. From time to time the Selling Securityholders may engage in short sales,
short sales against the box, puts and calls and other transactions in securities
of Grant Prideco, or derivatives thereof, and may sell and deliver their shares
in connection therewith. In addition, the Selling Securityholders may from time
to time sell their Securities in transactions permitted by Rule 144 under the
Securities Act.

     As of the date of this prospectus, we have engaged no underwriter, broker,
dealer or agent in connection with any distribution of Securities pursuant to
this prospectus by the Selling Securityholders. To the extent required, the type
and amount of Securities to be sold, the purchase price, the name of any
applicable agent, broker, dealer or underwriter and any applicable commissions
with respect to a particular offer will be set forth in the applicable
prospectus supplement. The aggregate net proceeds to the Selling Securityholders
from the sale of their Securities offered hereby will be the sale price of those
shares, less any commissions, if any, and other expenses of issuance and
distribution not borne by us.

     The Selling Securityholders and any brokers, dealers, agents or
underwriters that participate with the Selling Securityholders in a distribution
of Securities may be deemed to be "underwriters" within the meaning of the
Securities Act, in which event any discounts, concessions and commissions
received by such brokers, dealers, agents or underwriters and any profit on the
resale of the shares purchased by them may be deemed to be underwriting
discounts and commissions under the Securities Act.

     The applicable prospectus supplement will set forth the extent to which we
will have agreed to bear fees and expenses of the Selling Securityholders in
connection with the registration of the Securities being offered hereby by them.
We may, if so indicated in the applicable prospectus supplement, agree to
indemnify Selling Securityholders against certain civil liabilities, including
liabilities under the Securities Act.

                                       25
<PAGE>   30

                                 LEGAL MATTERS

     Unless otherwise specified in a prospectus supplement relating to
particular Securities, certain legal matters with respect to the validity of the
Securities will be passed upon for the Company by Fulbright & Jaworski L.L.P.,
Houston, Texas, and for the underwriters, dealers or agents, if any, of a
particular issue of Securities, by Andrews Kurth L.L.P., Houston, Texas.

                                    EXPERTS

     The financial statements incorporated by reference in this prospectus and
elsewhere in the registration statement have been audited by Arthur Andersen
LLP, independent public accountants, as indicated in their reports with respect
thereto, and are included herein in reliance upon the authority of said firm as
experts in accounting and auditing in giving said reports.

     Our board will select before the end of fiscal 2000 an independent
accounting firm to audit our financial statements for the year ending December
31, 2000. Arthur Andersen LLP has served as independent public accountants of
Grant Prideco through the periods covered by the financial statements included
in our Form 10 registration statement.

                      WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and current reports, proxy statements and other
information with the Securities and Exchange Commission. You may read and copy
and document we file at the Securities and Exchange Commission's public
reference rooms in Washington, D.C., New York, New York and Chicago, Illinois.
Please call the Securities and Exchange Commission at (800) SEC-0330 for further
information on the public reference rooms. Our Securities and Exchange
Commission filings are also available to the public at the Securities and
Exchange Commission's wed site at http://www.sec.gov. In addition, documents
filed by Grant Prideco can be inspected at the offices of the New York Stock
Exchange, Inc., New York, New York.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE


     The Securities and Exchange Commission allows us to "incorporate by
reference" into this prospectus the information we file with it, which means
that we can disclose important information to you by referring you to those
documents. The information incorporated by reference is considered to be part of
this prospectus, and later information that we file with the SEC will
automatically update and supersede this information. We incorporate by reference
our Registration Statement on Form 10 (File No. 001-15423), our Quarterly Report
on Form 10-Q for the quarter ended March 31, 2000 and any future filings we make
with the SEC under section 13(a), 13(c), 14 or 15(d) of the Securities Exchange
Act of 1934 until our offering is completed.


     We will provide without charge to each person, including any beneficial
owner, to whom this prospectus is delivered, upon written or oral request, a
copy of any document incorporated by reference in this prospectus, other than
exhibits to any such document not specifically described above. Requests for
such documents should be directed to Philip A. Choyce, Corporate Secretary,
Grant Prideco Inc., 1450 Lake Robbins Drive, Suite 600, The Woodlands, Texas
77380; telephone number: (281) 297-8500.

                                       26
<PAGE>   31

                 PART II INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The following table sets forth the estimated expenses in connection with
the distribution of the Securities covered by this Registration Statement. All
of the expenses will be borne by the Company except as otherwise indicated.

<TABLE>
<S>                                                         <C>
  Registration fee under the Securities Act..............   $132,000
  Printing and engraving expenses*.......................     50,000
  Legal fees and expenses*...............................     75,000
  Accounting fees and expenses*..........................     75,000
  Fees and expenses of trustee and counsel*..............     15,000
  Miscellaneous*.........................................      3,000
                                                            --------
          Total*.........................................   $350,000
</TABLE>

- ---------------

 *  Estimated solely for the purpose of this Item. Actual expenses may be more
    or less, depending on the nature of the offering and the type of security.

ITEM 15. INDEMNIFICATION OF OFFICERS AND DIRECTORS.

     Delaware law and our certificate of incorporation and bylaws include
provisions designed to limit the liability of our officers and directors and, in
certain circumstances, to indemnify our officers and directors against certain
liabilities. These provisions are designed to encourage qualified individuals to
serve as our officers and directors.

  Exculpation Of Monetary Liability

     Under Delaware law, a corporation may include provisions in its certificate
of incorporation that relieve its directors of monetary liability for breaches
of their fiduciary duty to the corporation, except under certain circumstances,
including

     - a breach of the director's duty of loyalty,

     - acts or omissions of the director not in good faith or which involve
       intentional misconduct or a knowing violation of law,

     - the approval of an improper payment of a dividend or an improper purchase
       by the corporation of the corporation's stock or

     - any transaction from which the director derived an improper personal
       benefit.

     Our certificate of incorporation will provide that our directors are not
liable to us or our stockholders for monetary damages for breach of their
fiduciary duty, subject to the restrictions above. These limitations of
liability may not affect claims arising under the federal securities laws.

  Indemnification

     Under Section 145 of the Delaware General Corporation Law and our bylaws,
we are obligated to indemnify our present and former directors and officers and
may indemnify other employees and individuals against expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement in connection
with specified actions, suits or proceedings, whether civil, criminal,
administrative or investigative (other than an action by or in the right of the
corporation, a "derivative action"), if the person to whom indemnity is granted
acted in good faith and in a manner he or she reasonably believed to be in or
not opposed to our best interests, and with respect to any criminal action or
proceeding, had no reasonable cause to believe his or her conduct was unlawful.
A similar standard of care is applicable in the case of derivative actions,
except that indemnification extends only to expenses (including attorneys' fees)

                                      II-1
<PAGE>   32

incurred in connection with defense or settlement of such an action, and the
Delaware General Corporation Law requires court approval before there can be any
indemnification where the person seeking indemnification has been found liable
to Grant Prideco.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors and officers and controlling persons pursuant to
the foregoing provisions, we have been advised that, in the opinion of the SEC,
such indemnification is against public policy as expressed in the Securities Act
and is, therefore, unenforceable.

     ITEM 16. EXHIBITS.


<TABLE>
<C>                      <S>
          2.1 (b)        -- Distribution Agreement, dated as of March 22, 2000,
                            between Weatherford and Grant
          3.1 (b)        -- Restated Certificate of Incorporation of Grant
          3.2 (a)        -- Restated Bylaws of Grant
          4.1 (b)        -- Subordinated Promissory Note to Weatherford, dated April
                            14, 2000
          4.2            -- Subordination Agreement, dated April 14, 2000, among
                            Grant, Weatherford and Transamerica Business Credit
                            Corporation, as agent
          4.3 (b)        -- Loan and Security Agreement, dated April 14, 2000, among
                            Grant and certain of its subsidiaries, the Lenders
                            identified therein and Transamerica Business Credit
                            Corporation, as agent
          4.4 (b)        -- Guaranty, dated April 14, 2000, by Grant's subsidiaries
                            in favor of Transamerica Business Credit Corporation, as
                            agent
          4.5 (b)        -- Pledge Agreement, dated April 14, 2000, by Grant's
                            subsidiaries in favor of Transamerica Business Credit
                            Corporation, as agent
         12.1 (b)        -- Statement of Computation of Ratios
         21.1 (a)        -- List of Subsidiaries of Grant
         23.1            -- Consent of Arthur Andersen LLP
</TABLE>


- ---------------

(a)  Incorporated by reference to Grant's Registration Statement on Form 10
     (file No. 00115423).


(b)  Previously filed.


     We will file, as an exhibit to a Current Report on Form 8-K, (a) any
underwriting agreement relating to Securities offered hereby, (b) the
instruments setting forth the terms of any debt securities, preferred stock,
depositary shares or warrants and (c) any required opinion of counsel as to the
validity of any Securities and as to certain tax matters relative to Securities.

ITEM 17. UNDERTAKINGS.

     The registrant hereby undertakes:

     - To file, during any period in which offers or sales are being made, a
       post-effective amendment to this registration statement:

        - to include any prospectus required by section 10(a)(3) of the Act of
          1933;

        - to reflect in the prospectus any facts or events arising after the
          effective date of the registration statement (or the most recent
          post-effective amendment thereof) which, individually or in the
          aggregate, represent a fundamental change in the information set forth
          in the registration statement; and

        - to include any material information with respect to the plan of
          distribution not previously disclosed in the registration statement or
          any material change to such information in the registration statement;
          provided, however, that the undertakings set forth in the previous two
          clauses do not apply if the information required to be included in a
          post-effective amendment by those clauses is contained in periodic
          reports filed with or furnished to the Securities and Exchange
          Commission by the Company pursuant to section 13 or section 15(d) of
          the

                                      II-2
<PAGE>   33

          Securities Exchange Act of 1934 that are incorporated by reference in
          the registration statement.

     - That, for the purpose of determining any liability under the Securities
       Act of 1933, each such post-effective amendment shall be deemed to be a
       new registration statement relating to the Securities offered therein,
       and the offering of such Securities at that time shall be deemed to be
       the initial bona fide offering thereof.

     - To remove from registration by means of a post-effective amendment any of
       the Securities being registered which remain unsold at the termination of
       the offering.

     - That, for purposes of determining any liability under the Securities Act
       of 1933, each filing of the Company's annual report pursuant to section
       13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where
       applicable, each filing of an employee benefit plan's annual report
       pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is
       incorporated by reference in the registration statement shall be deemed
       to be a new registration statement relating to the Securities offered
       therein, and the offering of such Securities at that time shall be deemed
       to be the initial bona fide offering thereof.

     - That, for purposes of determining any liability under the Securities Act
       of 1933, the information omitted from the form of prospectus filed as
       part of a registration statement in reliance upon Rule 430A and contained
       in a form of prospectus filed by the registrants pursuant to Rule
       424(b)(1) or (4) or 497(h) under the Securities Act of 1933 shall be
       deemed to be part of this registration statement as of the time it was
       declared effective.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the Securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

                                      II-3
<PAGE>   34

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, Grant Prideco,
Inc. certifies that it has reasonable grounds to believe that it meets all of
the requirements for filing on Form S-3 and has duly caused this Registration
Statement or amendment to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of The Woodlands, State of Texas, on May 26, 2000.


                                            GRANT PRIDECO, INC.

                                            By:      /s/ JOHN C. COBLE
                                              ----------------------------------
                                                        John C. Coble
                                                President and Chief Executive
                                                            Officer


     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities on May 26, 2000.



<TABLE>
<C>                                             <S>

              /s/ JOHN C. COBLE                 Chief Executive Officer, President and
- ---------------------------------------------   Director (principal executive officer)
                John C. Coble

            /s/ FRANCES R. POWELL               Chief Financial Officer, Vice President and
- ---------------------------------------------   Treasurer (principal financial and accounting
              Frances R. Powell                 officer)

                      *                         Chairman of the Board, Director
- ---------------------------------------------
           Bernard J. Duroc-Danner

                      *                         Director
- ---------------------------------------------
               Eliot M. Fried

                      *                         Director
- ---------------------------------------------
              Sheldon B. Lubar

                      *                         Director
- ---------------------------------------------
             William E. Macaulay

                      *                         Director
- ---------------------------------------------
            Robert K. Moses, Jr.

                                                Director
- ---------------------------------------------
               Robert A. Rayne

            By: /s/ JOHN C. COBLE
- ---------------------------------------------
                John C. Coble
              Attorney-in-fact
</TABLE>


                                      II-4
<PAGE>   35

                               INDEX TO EXHIBITS


<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          2.1 (b)        -- Distribution Agreement, dated as of March 22, 2000,
                            between Weatherford and Grant
          3.1 (b)        -- Restated Certificate of Incorporation of Grant
          3.2 (a)        -- Restated Bylaws of Grant
          4.1 (b)        -- Subordinated Promissory Note to Weatherford, dated April
                            14, 2000
          4.2            -- Subordination Agreement, dated April 14, 2000, among
                            Grant, Weatherford and Transamerica Business Credit
                            Corporation, as agent
          4.3 (b)        -- Loan and Security Agreement, dated April 14, 2000, among
                            Grant and certain of its subsidiaries, the Lenders
                            identified therein and Transamerica Business Credit
                            Corporation, as agent
          4.4 (b)        -- Guaranty, dated April 14, 2000, by Grant's subsidiaries
                            in favor of Transamerica Business Credit Corporation, as
                            agent
          4.5 (b)        -- Pledge Agreement, dated April 14, 2000, by Grant's
                            subsidiaries in favor of Transamerica Business Credit
                            Corporation, as agent
         12.1 (b)        -- Statement of Computation of Ratios
         21.1 (a)        -- List of Subsidiaries of Grant
         23.1            -- Consent of Arthur Andersen LLP
</TABLE>


- ---------------

(a)  Incorporated by reference to Grant's Registration Statement on Form 10
     (file No. 00115423).


(b)  Previously filed.


<PAGE>   1
                                                                     EXHIBIT 4.2


                             SUBORDINATION AGREEMENT


                  SUBORDINATION AGREEMENT dated as of April 14, 2000 (this
"Agreement") by Weatherford International, Inc., a Delaware corporation
("Weatherford"), as the payee of that certain Subordinated Promissory Note of
even date herewith in the original principal amount of $100,000,000 (as amended,
supplemented or otherwise modified from time to time, the "Junior Note") from
Grant Prideco, Inc., a Delaware corporation ("GPI"), to Weatherford (in such
capacity as payee, together with its successors and assigns, the "Junior
Lender"), in favor of Transamerica Business Credit Corporation, a Delaware
corporation ("TBCC"), as agent (the "Agent") for the lenders (the "Lenders")
party to the Loan and Security Agreement of even date herewith (as amended,
supplemented or otherwise modified from time to time, the "Senior Loan
Agreement") among each of the subsidiaries of GPI specified in Schedule 1 hereto
(the "Borrowers"), the Agent and the Lenders (together with the Lenders'
respective successors and assigns, the "Senior Lenders").


                              W I T N E S S E T H :

                  WHEREAS, before the date hereof, GPI was a wholly owned
Subsidiary of Weatherford and had intercompany indebtedness to Weatherford,
$100,000,000 of which is evidenced by the Junior Note;

                  WHEREAS, Weatherford will distribute all the shares of common
stock of GPI to the shareholders of Weatherford in connection with a spinoff
(the "Spinoff") to occur substantially simultaneously with the closing of the
transactions contemplated by the Senior Loan Agreement;

                  WHEREAS, in connection with the Spinoff, the Senior Lenders
have agreed to make loans and other extensions of credit to the Borrowers, and
GPI has agreed to guaranty the obligations of the Borrowers to the Agent and the
Senior Lenders arising in connection therewith under the Guaranty of even date
herewith (as amended, supplemented or otherwise modified from time to time, the
"Guaranty") by GPI and certain of its Subsidiaries in favor of the Agent for the
benefit of itself and the Senior Lenders;

                  WHEREAS, it is a condition precedent to the effectiveness of
the Senior Loan Agreement that the Junior Lender and GPI shall have executed and
delivered this Agreement subordinating its rights with respect to the Junior
Obligations


<PAGE>   2


to the rights of the Agent and the Senior Lenders with respect to the Senior
Obligations;

                  NOW, THEREFORE, in consideration of the promises contained
herein and to induce the Agent and the Senior Lenders to enter into the Senior
Loan Agreement and to make loans and other extensions of credit to the Borrowers
thereunder, the Junior Lender agrees as follows:

                  SECTION 1. DEFINITIONS. Capitalized terms not otherwise
defined herein shall have the meanings set forth in the Senior Loan Agreement,
and the rules of usage set forth therein shall apply hereto.

                  SECTION 2. SUBORDINATION.

                           (a) All Junior Obligations (as defined below), and
all rights and remedies of the Junior Lender with respect thereto, are and shall
continue to be subject, subordinate and junior in right of payment to the Senior
Obligations (as defined below) including, without limitation, all interest on
the Senior Obligations at the rate stated in the Senior Loan Agreement from the
date of the filing by or against GPI or any Designated Loan Party that has
guaranteed (or is otherwise liable for), or whose assets secure in whole or in
part, the Senior Obligations (a "Designated Loan Party") of a petition under any
bankruptcy, insolvency or similar law to the date of the indefeasible payment in
full of the Senior Obligations ("Postpetition Interest"). The term "Junior
Obligations," as used in this Agreement, shall mean the principal of and
premium, if any, and interest on the Junior Note (including extensions, renewals
and refundings thereof) and any guaranty liabilities of any Designated Loan
Party in respect thereof together with all fees, costs and expenses relating
thereto, now or hereafter existing. The term "Senior Obligations," as used in
this Agreement, shall mean the principal amount of and premium, if any, and
interest on all Obligations of GPI or any Designated Loan Party to the Agent and
the Senior Lenders together with all fees, costs and expenses relating thereto,
whether direct or contingent, now or hereafter existing, due or to become due
to, or held or to be held by, the Agent and the Senior Lenders, whether created
directly or acquired by assignment or otherwise including, without limitation,
all indebtedness of GPI under the Guaranty (including extensions, renewals and
refundings thereof) and any agreement between or among GPI, any Designated Loan
Party, the Agent and the Senior Lenders, provided that, in no event shall the
Senior Obligations exceed the sum of (i) US$100,000,000, plus (ii) accrued
unpaid interest arising under the Senior Loan Agreement, plus (iii)
indemnification obligations, fees and reimbursable expenses due under or in
connection with the Senior Loan Agreement.



                                      -2-
<PAGE>   3


                           (b) Except as set forth in Section 2(c), the Junior
Lender shall not receive or accept any payment on the Junior Obligations,
whether as principal, premium, interest or otherwise (including by setoff or
right of recoupment), unless and until all the Senior Obligations including,
without limitation, all Post-petition Interest have been indefeasibly paid in
full in cash.

                           (c) The Junior Lender may receive, accept and retain
(i) regularly-scheduled interest payments on account of the Junior Note and (ii)
the payment or prepayment of the Junior Obligations from the proceeds of
Permitted Refinancing Indebtedness and from Net Cash Proceeds so long as, in
each case, immediately prior to and after giving effect to such payment or
prepayment, a Default or Event of Default under the Senior Loan Agreement shall
not have occurred and be continuing.

                           (d) If the Junior Lender shall receive any payment or
prepayment on the Junior Obligations that it is not entitled to receive under
the provisions of the foregoing subsection, the Junior Lender will hold any
amount so received in trust for the Agent and the Senior Lenders and shall, as
soon as possible, turn over such payment to the Agent in the form received to be
applied to the Senior Obligations.

                           (e) The Junior Lender will not commence any action or
proceeding against GPI or any Designated Loan Party to recover all or any part
of the Junior Obligations or join with any creditor, unless the Agent or the
Senior Lenders shall also have joined, in bringing against GPI or any Designated
Loan Party any such proceeding including, without limitation, any proceeding
under any bankruptcy, insolvency or similar law or any other proceeding the
result of which could give rise to an Insolvency Event until the earlier of (i)
the date on which the Commitments have been terminated, the Senior Obligations
have been indefeasibly paid in full in cash and all Letters of Credit have been
Collateralized or have terminated or expired and (ii) 180 days after the
occurrence of an Event of Default under and as defined in the Junior Note.

                           (f) Upon the occurrence of any Insolvency Event of
GPI or any Designated Loan Party or in the event of a sale of all or
substantially all of the assets or any other marshaling of the assets and
liabilities, or any recapitalization, refinancing or reorganization of GPI or
any Designated Loan Party, the Senior Obligations shall first be indefeasibly
paid in full in cash before the Junior Lender shall be entitled to receive any
money, distributions or other assets in any such proceeding. In any such event,
if the Junior Lender has not previously done so, the Agent may (without having
any obligation to do so), and is hereby irrevocably authorized and granted an
exclusive power (which power is coupled with an interest), but without imposing
any obligation upon the Agent, to file any claim, proof of claim or



                                      -3-
<PAGE>   4


other similar instrument necessary to enforce the obligations of GPI or any
Designated Loan Party in respect of the Junior Obligations, provided that the
Agent shall not exercise any such right or power unless it has given the Junior
Lender at least five Business Days' prior written notice of the Agent's
intention to do so. Further, upon the occurrence of any such Insolvency Event or
in any other statutory or nonstatutory proceeding, the Junior Lender shall vote
the Junior Note in such event or proceeding including, without limitation, in
connection with the election of trustees, the acceptance or rejection of plans
of reorganization and any other matter upon which the Junior Lender is entitled
to vote, in each case in a manner consistent with this Agreement in all
respects, and the Agent is hereby authorized to enjoin any attempt to vote the
Junior Note in a manner that would violate this subsection.

                           (g) The Agent or the Senior Lenders may, at any time
and from time to time, without the consent of or notice to the Junior Lender,
without incurring responsibility to the Junior Lender and without impairing or
releasing any right or obligation of the Agent or the Senior Lenders hereunder:

                           (i) Change the manner, place or terms of payment or
                  change or extend the time of payment of or renew or alter the
                  Senior Obligations or amend the Senior Loan Agreement in any
                  manner or enter into or amend in any manner any other
                  agreement relating to the Senior Obligations;

                           (ii) Sell, exchange, release or otherwise deal with
                  any property by whomsoever at any time pledged to secure, or
                  howsoever securing, the Senior Obligations;

                           (iii) Release any Person liable in any manner for the
                  payment or collection of any of the Senior Obligations,
                  including, without limitation, GPI or any Designated Loan
                  Party;

                           (iv) Exercise or refrain from exercising any rights
                  against GPI or any Designated Loan Party or any other Person;
                  or

                           (v) Apply any sums by whomsoever paid or however
                  realized to the Senior Obligations,

provided that the foregoing provisions shall not be deemed to authorize any
increase in the amount of the Senior Obligations.

                           (h) The Junior Lender waives notice of acceptance of
this Agreement.



                                      -4-
<PAGE>   5


                           (i) The Junior Lender will cause each note or other
instrument that evidences any Junior Obligations to bear upon its face a
statement or legend to the effect that such note or other instrument is
subordinated to the Senior Obligations in the manner and to the extent set forth
in this Agreement. The Junior Lender shall mark its books to show that the
Junior Obligations are so subordinated to the Senior Obligations.

                           (j) Subject to the indefeasible payment in full of
the Senior Obligations in immediately available funds, the Junior Lender shall
be subrogated to the Agent's and the Senior Lenders' rights to receive payments
or distributions in cash or property applicable to the Senior Obligations, and
no payment or distribution made to the Agent or the Senior Lenders by virtue of
this Agreement that otherwise would have been made to the Junior Lender shall be
deemed to be a payment by GPI or any Designated Loan Party on account of the
Junior Obligations, it being understood that the provisions of this Section 2
are intended solely for the purpose of defining the relative rights of the
Junior Lender, on the one hand, and the Agent and the Senior Lenders, on the
other hand.

                           (k) From time to time at the request of the Agent,
the Junior Lender will permit the Agent to inspect and make extracts from its
books and records pertaining to the Junior Obligations and to examine any
instrument or instruments or record or records now or hereafter held by the
Junior Lender creating or evidencing the Junior Obligations.

                           (l) The Junior Lender will not sell, assign, transfer
or otherwise dispose of all or any part of the Junior Obligations to any Person,
other than a Person owned by or under common ownership with the Junior Lender,
without such Person's agreement in writing to be bound as the Junior Lender's
successor by the terms of this Agreement.

                           (m) The Junior Lender agrees that it will not
exercise any right of setoff it may have on account of the Junior Obligations
against any obligation owing by the Junior Lender to any Borrower under any
Receivables.

                  SECTION 3. TERMINATION. This Agreement shall terminate and
cease to be of further effect upon the termination of the Commitments, the
indefeasible payment in full in cash of the Senior Obligations and the
termination, Collateralization or expiration of all Letters of Credit, or the
payment in full of the Junior Obligations so long as such payment is consistent
with Section 7.2(p) of the Senior Loan Agreement and the terms hereof.

                  SECTION 4. BENEFIT OF AGREEMENT. Nothing in this Agreement,
expressed or implied, shall give or be construed to give to any Person
including, without limitation, GPI or any



                                      -5-
<PAGE>   6


Designated Loan Party (but excluding the Agent and the Senior Lenders) any legal
or equitable right, remedy or claim under this Agreement, or under any covenant
or provision herein contained, all such covenants and provisions being for the
sole benefit of the Agent and the Senior Lenders.

                  SECTION 5. NOTICES. Except as otherwise provided herein, all
notices and other communications hereunder shall be in writing and sent by
certified or registered mail, return receipt requested, by overnight delivery
service, with all charges prepaid, or by telecopier followed by a hard copy sent
by regular mail, if to the Agent, then to Transamerica Business Credit
Corporation, 555 Theodore Fremd Avenue, Suite C-301, Rye, New York 10580,
Telecopy: (914) 921-0110, Attn.: Mr. Steven R. Fischer, Executive Vice
President, with a copy to Transamerica Business Credit Corporation, 9399 West
Higgins Road, Suite 600, Rosemont, Illinois 60018, Telecopy: (847) 685-1143,
Attn.: General Counsel, if to any Senior Lender, then to its address specified
on Schedule 2 to the Senior Loan Agreement, if to GPI or any Designated Loan
Party, then to Grant Prideco, Inc., 1450 Lake Robbins Drive, Suite 600, The
Woodlands, Texas 77380, Telecopy: (281) 297-8688, Attn.: Ms. Frances R. Powell
and Philip A. Choyce, Esq., with a copy to Fulbright & Jaworski L.L.P., 1301
McKinney, Suite 5100, Houston, Texas 77010-3095, Telecopy: (713) 651-5246,
Attn.: Joshua P. Agrons, Esq., and if to Weatherford, then to Weatherford
International, Inc., 515 Post Oak Boulevard, Suite 600, Houston, Texas 77027,
Telecopy: (713) 693-4230, Attn.: General Counsel, or, in each case, to such
other address as a party may specify to the other parties in the manner required
hereunder. All such notices and correspondence shall be deemed given (i) if sent
by certified or registered mail, three Business Days after being postmarked,
(ii) if sent by overnight delivery service, when received at the above stated
addresses or when delivery is refused and (iii) if sent by telecopier
transmission, when such transmission is confirmed.

                  SECTION 6. AMENDMENTS AND WAIVERS. No amendment or waiver of
any provision of this Agreement, or consent to any departure by the Junior
Lender, GPI or any Designated Loan Party therefrom, shall in any event be
effective unless the same shall be in writing and signed by the Agent, GPI and
the Junior Lender.

                  SECTION 7. DELAYS; PARTIAL EXERCISE OF REMEDIES. No delay or
omission of the Agent or any Senior Lender to exercise any right or remedy
hereunder shall impair any such right or operate as a waiver thereof. No single
or partial exercise by the Agent or any Senior Lender of any right or remedy
shall preclude any other or further exercise thereof, or preclude any other
right or remedy.



                                      -6-
<PAGE>   7


                  SECTION 8. COUNTERPARTS; TELECOPIED SIGNATURES. This Agreement
and any waiver or amendment hereto may be executed in counterparts and by the
parties hereto in separate counterparts, each of which when so executed and
delivered shall be an original, but all of which shall together constitute one
and the same instrument. This Agreement may be executed and delivered by
telecopier or other facsimile transmission all with the same force and effect as
if the same was a fully executed and delivered original manual counterpart.

                  SECTION 9. SEVERABILITY. In case any provision in or
obligation under this Agreement shall be invalid, illegal or unenforceable in
any jurisdiction, the validity, legality and enforceability of the remaining
provisions or obligations, or of such provision or obligation in any other
jurisdiction, shall not in any way be affected or impaired thereby.

                  SECTION 10. ENTIRE AGREEMENT; SUCCESSORS AND ASSIGNS. This
Agreement constitutes the entire agreement among the parties, supersedes any
prior written and verbal agreements among them, and shall bind and benefit the
parties (including, without limitation, the Agent and the Senior Lenders) and
their respective successors and permitted assigns.

                  SECTION 11. SPECIFIC PERFORMANCE. THE AGENT IS HEREBY
AUTHORIZED TO DEMAND SPECIFIC PERFORMANCE OF THIS AGREEMENT AT ANY TIME WHEN THE
JUNIOR LENDER SHALL HAVE FAILED TO COMPLY WITH ANY OF THE PROVISIONS OF THIS
AGREEMENT APPLICABLE TO IT. THE JUNIOR LENDER HEREBY IRREVOCABLY WAIVES ANY
DEFENSE BASED ON THE ADEQUACY OF A REMEDY AT LAW THAT MIGHT BE ASSERTED AS A BAR
TO SUCH REMEDY OF SPECIFIC PERFORMANCE.

                  SECTION 12. GOVERNING LAW. THE VALIDITY, INTERPRETATION AND
ENFORCEMENT OF THIS AGREEMENT AND ANY DISPUTE ARISING OUT OF OR IN CONNECTION
WITH THIS AGREEMENT, WHETHER SOUNDING IN CONTRACT, TORT, EQUITY OR OTHERWISE,
SHALL BE GOVERNED BY THE INTERNAL LAWS (AS OPPOSED TO THE CONFLICTS OF LAW
PROVISIONS OTHER THAN SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW)
AND DECISIONS OF THE STATE OF NEW YORK.

                  SECTION 13. SUBMISSION TO JURISDICTION. ALL DISPUTES BETWEEN
OR AMONG ANY OF THE PARTIES HERETO, WHETHER SOUNDING IN CONTRACT, TORT, EQUITY
OR OTHERWISE, SHALL BE RESOLVED ONLY BY STATE AND FEDERAL COURTS LOCATED IN NEW
YORK, NEW YORK AND THE COURTS TO WHICH AN APPEAL THEREFROM MAY BE TAKEN;
PROVIDED, HOWEVER, THAT THE AGENT OR A SENIOR LENDER SHALL HAVE THE RIGHT, TO
THE EXTENT PERMITTED BY APPLICABLE LAW, TO PROCEED AGAINST THE JUNIOR LENDER,
GPI OR ANY DESIGNATED LOAN PARTY TO ENFORCE THE PROVISIONS HEREOF IN ANY OTHER
COURTS OF COMPETENT JURISDICTION AND VENUE IN NEW YORK OR TEXAS. EACH OF THE
JUNIOR LENDER AND GPI WAIVES ANY OBJECTION THAT IT MAY HAVE TO THE LOCATION OF
ANY SUCH COURT IN WHICH THE AGENT OR A SENIOR LENDER HAS COMMENCED A PROCEEDING,
INCLUDING, WITHOUT LIMITATION, ANY OBJECTION TO THE LAYING OF VENUE OR BASED ON
FORUM NON CONVENIENS.



                                      -7-
<PAGE>   8


                  SECTION 14. JURY TRIAL. EACH OF THE PARTIES HERETO HEREBY
WAIVES TO THE FULLEST EXTENT PERMITTED BY LAW ANY RIGHT TO A TRIAL BY JURY IN
ANY ACTION OR PROCEEDING BASED UPON, ARISING OUT OF, OR IN ANY WAY RELATING TO
(I) THIS AGREEMENT OR (II) ANY CONDUCT, ACTS OR OMISSIONS OF THE JUNIOR LENDER,
GPI, ANY DESIGNATED LOAN PARTY, THE AGENT OR A SENIOR LENDER OR ANY OF THEIR
RESPECTIVE DIRECTORS, OFFICERS, EMPLOYEES, AGENTS, ATTORNEYS OR OTHER
AFFILIATES, IN EACH CASE WHETHER SOUNDING IN CONTRACT OR TORT OR OTHERWISE.



                                      -8-
<PAGE>   9


                  IN WITNESS WHEREOF, the undersigned has caused this Agreement
to be executed by its proper and duly authorized officer as of the date first
set forth above.


                                          WEATHERFORD INTERNATIONAL, INC.



                                          By: /s/ CURTIS W. HUFF
                                             -----------------------------------
                                             Name: Curtis W. Huff
                                             Title: Chief Financial Officer,
                                             General Counsel and Secretary




                                      -9-
<PAGE>   10


                                 ACKNOWLEDGEMENT


                  Grant Prideco, Inc. and its undersigned subsidiaries hereby
acknowledge the provisions of the foregoing Subordination Agreement and agree to
abide by the terms thereof.


                                     GRANT PRIDECO, INC.



                                     By: /s/ PHILIP A. CHOYCE
                                        ----------------------------------------
                                        Name: Philip A. Choyce
                                        Title: Vice President


                                     GRANT PRIDECO, LP

                                     By:  Grant Prideco Holding LLC
                                          its General Partner



                                     By: /s/ PHILIP A. CHOYCE
                                        ----------------------------------------
                                        Name: Philip A. Choyce
                                        Title: Vice President


                                     GRANT PRIDECO TECHNOLOGY, INC.



                                     By: /s/ LINDA S. BUBACE
                                        ----------------------------------------
                                        Name: Linda S. Bubace
                                        Title: Vice President



                                      -10-



<PAGE>   1

                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated January 28, 2000
included in Grant Prideco, Inc.'s Form 10 for the year ended December 31, 1999
and to all references to our Firm included in this registration statement.


/s/ Arthur Andersen LLP

Houston, Texas
May 26, 2000



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