EXHIBIT 10.1(A)

                                 PROMISSORY NOTE

$300,000.00                       Houston, Texas                   June 14, 2000


      FOR VALUE RECEIVED, the undersigned, Gary H. Martin and William R. Massey
(the "Borrowers") JOINTLY AND SEVERALLY PROMISE TO PAY to the order of
Industrial Holdings, Inc., a Texas corporation (the "Lender"), in Houston,
Harris County, Texas, the sum of THREE HUNDRED THOUSAND DOLLARS ($300,000.00),
in lawful money of the United States of America and in immediately available
funds. No interest shall accrue on the principal amount, EXCEPT THAT in the
event of default in payment herein provided, interest shall accrue on the unpaid
principal amount in the manner set forth below. All outstanding principal shall
be due and payable in full on September 1, 2000 (the "Maturity Date").

      At any time before the Maturity Date, the Borrowers may prepay all or any
part of this Note without any penalty.

      An "Event of Default" shall occur hereunder if (i) the Borrowers fail to
make any payment herein required, (ii) the Borrowers breach any covenant or
agreement in that certain Stock Purchase Agreement dated June 13, 2000 but
effective as of April 1, 2000 by and among the Lender, Blastco Services Company
("Blastco") and the Borrowers, (iii) Blastco fails to make any payment required
in that certain Promissory Note dated as of even date herewith in the principal
amount of $200,000 payable to OF Acquisition, L.P. or (iv) Blastco fails to make
any payment required in that certain Promissory Note dated as of even date
herewith in the principal amount of $500,000 payable to the Lender. If an Event
of Default occurs, this Note shall become automatically due and payable without
notice and interest shall accrue on the unpaid principal amount at a rate of 15%
per annum. Any such interest charges will be calculated on the amount of unpaid
principal on the actual number of days from the date of the Event of Default
until full payment of the unpaid principal amount herein required on the basis
of a 365-day year.

      It is agreed that time is of the essence of this Note.

      Borrowers hereby jointly and severally agree to pay all expenses incurred,
including reasonable attorneys' fees, all of which shall become a part of the
principal hereof, if this Note is placed in the hands of an attorney for
collection or if collected by suit or through any probate, bankruptcy, or legal
proceedings.

      It is the intention of the parties hereto to comply with all applicable
usury laws; accordingly, it is agreed that notwithstanding any provision to the
contrary in this Note, or in any of the

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documents securing payment hereof or otherwise relating hereto, no such
provision shall require the payment or permit the collection of interest in
excess of the maximum non-usurious rate permitted by applicable law from time to
time in effect as such law may be interpreted, amended, revised, supplemented or
enacted (the "Maximum Rate"). If any such excess of interest in such respect is
provided for, or shall be adjudicated to be so provided for, in this Note or in
any of the documents relating hereto, then in such event (1) the provisions of
this paragraph shall govern and control, (2) neither the Borrowers, nor their
heirs, legal representatives, successors or assigns nor any other party liable
for the payment hereof, shall be obligated to pay the amount of such interest to
the extent that it is in excess of the Maximum Rate, (3) any such excess which
may have been collected shall be either applied as a credit against the then
unpaid principal amount hereof or refunded to the Borrowers, and (4) the
provisions of this Note shall be automatically reformed so that the effective
rate of interest shall be reduced to the Maximum Rate. For the purposes of
determining the Maximum Rate, all interest payments with respect to this Note
shall be amortized, prorated and spread throughout the full term of the note so
that the effective rate of interest on account of this Note is uniform
throughout the term hereof.

      Each maker, surety, guarantor, and endorser (i) waives demand, grace,
notice, presentment for payment, notice of intention to accelerate the maturity
hereof and protest, (ii) agrees that this Note may be renewed, and the time of
payment extended from time to time, without any notice and without releasing any
of the foregoing, and (iii) agrees that without notice or consent from any
maker, surety, guarantor, or endorser, the Lender may release any party who
might be liable for this Note.

      The Borrowers represent and warrant that this loan is for business,
commercial, investment, or similar purpose and not primarily for personal,
family, household or agricultural use, as such terms are used in Chapter One of
the Texas Credit Code.

              [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK.]

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      EXECUTED as of the date first set forth above.

                                                /S/ GARY H. MARTIN
                                                    GARY H. MARTIN

                                                /S/ WILLIAM R. MASSEY
                                                    WILLIAM R. MASSEY

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