Document:

Exhibit 4.1

 

	NUMBER	UNITS 

U-

 

SEE REVERSE FOR CERTAIN DEFINITIONS

 

CUSIP [_] 

 

INDUSTREA ACQUISITION CORP. 

 

UNITS CONSISTING OF ONE SHARE OF CLASS A
COMMON STOCK AND ONE-HALF OF ONE WARRANT, 

EACH WHOLE WARRANT ENTITLING THE HOLDER TO
PURCHASE ONE SHARE OF CLASS A COMMON STOCK 

 

THIS CERTIFIES THAT                     
is the owner of          Units.

 

Each
Unit (“Unit”) consists of one (1) share of Class A common stock, par value $0.0001 per
share (“Common Stock”), of Industrea Acquisition Corp., a Delaware corporation
(the “Company”), and one-half (1/2) of one warrant (the
“Warrant”). Each whole Warrant entitles the holder to purchase one (1) share (subject to
adjustment) of Common Stock for $11.50 per share (subject to adjustment). Each Warrant will become exercisable on the
later of (i) thirty (30) days after the Company’s completion of a merger, capital stock exchange, asset
acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (each a
“Business Combination”), or (ii) twelve (12) months from the closing of the
Company’s initial public offering, and will expire unless exercised before 5:00 p.m., New York City Time, on the date
that is five (5) years after the date on which the Company completes its initial Business Combination, or earlier upon
redemption or liquidation (the “Expiration Date”). The Common Stock and Warrants comprising
the Units represented by this certificate are not transferable separately prior
to             , 2017, unless FBR Capital Markets & Co.
elects to allow separate trading earlier, subject to the Company’s filing of a Current Report on Form 8-K with
the Securities and Exchange Commission containing an audited balance sheet reflecting the Company’s receipt of
the gross proceeds of the Company’s initial public offering and issuing a press release announcing when separate
trading will begin. The terms of the Warrants are governed by a Warrant Agreement, dated as
of             , 2017, between the Company and Continental
Stock Transfer & Trust Company, as Warrant Agent, and are subject to the terms and provisions contained therein, all
of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the
Warrant Agreement are on file at the office of the Warrant Agent at 1 State Street, 30th Floor, New York, New York
10004, and are available to any Warrant holder on written request and without cost.

 

This certificate is not valid unless countersigned
by the Transfer Agent and Registrar of the Company.

 

This certificate shall be governed by and construed
in accordance with the internal laws of the State of New York.

 

Witness the facsimile signature of a duly authorized
signatory of the Company.

 

	 	 	 
	Authorized Signatory	 	Transfer Agent

 

     

     

    

 

Industrea Acquisition Corp. 

 

The Company will furnish without charge to
each unitholder who so requests, a statement of the powers, designations, preferences and relative, participating, optional or
other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions
of such preferences and/or rights.

 

The following
abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out
in full according to applicable laws or regulations: 

 

	TEN COM	— 	as tenants in common	 	UNIF GIFT MIN ACT 	—  	 	Custodian 	 
	 	 	 	 	 	 	(Cust)	 	(Minor)
	TEN ENT	—	as tenants by the entireties	 	 	 	 
	 	 	 	 	 	 	under Uniform Gifts to Minors Act
	JT TEN	—	as joint tenants with right of 	 	 	 	 
	 	 	survivorship and not as tenants in common	 	 	 	(State)

 

Additional abbreviations may also be used though
not in the above list.

 

For value received,                     
hereby sell, assign and transfer unto                     

 

(PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING
NUMBER OF ASSIGNEE)

 

(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING
ZIP CODE, OF ASSIGNEE)

 

Units represented by the within Certificate,
and do hereby irrevocably constitute and appoint 

 

Attorney to transfer the said Units on the books of the
within named Company with full power of substitution in the premises.

 

Dated 

	 	 
	 	 
	 	Notice: The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.

 

	Signature(s) Guaranteed:	 
	 	 
	 	 
	THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE).	 

 

     

     

    

 

As more fully described in, and subject to the terms and conditions described in, the Company’s
final prospectus for its initial public offering dated            
, the holder(s) of this certificate shall be entitled to receive a pro-rata portion of certain funds held in the trust account
established in connection with the Company’s initial public offering (i) in the event that the Company redeems the shares
of Class A common stock sold in its initial public offering and liquidates because it does not consummate an initial business combination
within the time period set forth in the Company’s Amended and Restated Certificate of Incorporation, as the same may be amended
from time to time, or (ii) if the holder(s) properly redeems for cash his, her or its respective shares of Class A common stock
represented by this certificate in connection with (x) a proxy solicitation or tender offer in connection with a proposed initial
business combination or (y) a stockholder vote to amend the Company’s Amended and Restated Certificate of Incorporation that
would affect substance or timing of the Company’s obligation to redeem 100% of the Class A common stock if it does not consummate
an initial business combination within the time set forth in the Company’s Amended and Restated Certificate of Incorporation,
as the same may be amended from time to time. In no other circumstances shall the holder(s) have any right or interest of any kind
in or to the trust account.Exhibit 4.2

 

	NUMBER	SHARES
	C-	 

 

SEE REVERSE FOR CERTAIN DEFINITIONS

 

CUSIP [●]

 

INDUSTREA ACQUISITION CORP.

 

CLASS A COMMON STOCK

 

THIS CERTIFIES THAT                 is
the owner of                 fully paid and
non-assessable shares of Class A Common Stock, par value $0.0001 per share, of Industrea Acquisition Corp., a Delaware corporation
(the “Company”), transferable on the books of the Company in person or by duly authorized attorney upon
surrender of this certificate properly endorsed.

 

This certificate is not
valid unless countersigned by the Transfer Agent and registered by the Registrar of the Company.

 

Witness the facsimile signature
of a duly authorized signatory of the Company.

 

	 	 
	 	Authorized Signatory

 

	 	 
	 	Transfer Agent

   

     

     

    

 

Industrea Acquisition Corp.

 

The Company will furnish
without charge to each stockholder who so requests, a statement of the powers, designations, preferences and relative, participating,
optional or other special rights of each class of equity or series thereof of the Company and the qualifications, limitations,
or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and shall be
held subject to all the provisions of the Amended and Restated Certificate of Incorporation of the Company and all amendments thereto
and resolutions of the Board of Directors providing for the issue of securities (copies of which may be obtained from the secretary
of the Company), to all of which the holder of this certificate by acceptance hereof assents. The following abbreviations, when
used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to
applicable laws or regulations.

 

The following abbreviations,
when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according
to applicable laws or regulations:

 

	TEN COM	— 	as tenants in common	 	UNIF GIFT MIN ACT 	—  	 	Custodian 	 
	 	 	 	 	 	 	(Cust)	 	(Minor)
	TEN ENT	—	as tenants by the entireties	 	 	 	 
	 	 	 	 	 	 	Under Uniform Gifts to Minors Act
	JT TEN	—	as joint tenants with right of 	 	 	 	 
	 	 	survivorship and not as tenants in common	 	 	 	(State)

 

Additional abbreviations may also be used though
not in the above list.

 

For value received,                  hereby
sells, assigns and transfers unto

 

(PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING
NUMBER(S) OF ASSIGNEE(S))

 

(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES),
INCLUDING ZIP CODE, OF ASSIGNEE(S))

 

shares of Class A common stock represented
by the within certificate, and do hereby irrevocably constitute and appoint                                   Attorney
to transfer the said shares of Class A common stock on the books of the within named Company with full power of substitution in
the premises.

 

Dated

 

	 	 	 
	 	Notice: 	The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.

 

	Signature(s) Guaranteed:	 
	 	 
	 	 
	THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE)). 	 

 

     

     

    

 

As more fully described
in, and subject to the terms and conditions described in, the Company’s final prospectus for its initial public offering
dated                   , the holder(s)
of this certificate shall be entitled to receive a pro-rata portion of certain funds held in the trust account established in connection
with the Company’s initial public offering (i) in the event that the Company redeems the shares of Class A common stock sold
in its initial public offering and liquidates because it does not consummate an initial business combination within the time period
set forth in the Company’s Amended and Restated Certificate of Incorporation, as the same may be amended from time to time,
or (ii) if the holder(s) properly redeems for cash his, her or its respective shares of Class A common stock represented by this
certificate in connection with (x) a proxy solicitation or tender offer in connection with a proposed initial business combination
or (y) a stockholder vote to amend the Company’s Amended and Restated Certificate of Incorporation that would affect substance
or timing of the Company’s obligation to redeem 100% of the Class A common stock if it does not consummate an initial business
combination within the time set forth in the Company’s Amended and Restated Certificate of Incorporation, as the same may
be amended from time to time. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the
trust account.

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