Exhibit 4.3


 


[Form of Warrant Certificate]


 


[FACE]


 


Number


 


Redeemable Warrants


 


THIS REDEEMABLE WARRANT SHALL BE VOID IF NOT
EXERCISED PRIOR TO

THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR

IN THE WARRANT AGREEMENT DESCRIBED BELOW


 


METAL SKY STAR ACQUISITION CORPORATION


Incorporated Under the Laws of the Cayman Islands


 


		 	CUSIP__________



 


Warrant Certificate


 


This Warrant Certificate certifies that             ,
or registered assigns, is the registered holder of warrant(s) evidenced hereby (the “Warrants” and each,
a “Warrant”) to purchase ordinary shares, $0.001 par value per share (“Ordinary Shares”),
of Metal sky star Acquisition Corporation, a Cayman Islands exempted company (the “Company”). Each Warrant entitles
the holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive from the Company that number
of fully paid and non-assessable Ordinary Shares as set forth below, at the exercise price (the “Exercise Price”)
as determined pursuant to the Warrant Agreement, payable in lawful money (or through “cashless exercise” as
provided for in the Warrant Agreement) of the United States of America upon surrender of this Warrant Certificate and payment of the Exercise
Price at the office or agency of the Warrant Agent referred to below, subject to the conditions set forth herein and in the Warrant Agreement.
Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement.


 


Each Warrant is initially exercisable for one-half
of one fully paid and non-assessable Ordinary Share. No fractional shares will be issued upon exercise of any Warrant. If, upon the exercise
of Warrants, a holder would be entitled to receive a fractional interest in an Ordinary Share, the Company will, upon exercise, round
down to the nearest whole number the number of Ordinary Shares to be issued to the Warrant holder. The number of Ordinary Shares issuable
upon exercise of the Warrants is subject to adjustment upon the occurrence of certain events set forth in the Warrant Agreement.


 


The initial Exercise Price per whole Ordinary Share
for any Warrant is equal to $11.50 per Ordinary Share. The Exercise Price is subject to adjustment upon the occurrence of certain events
set forth in the Warrant Agreement.


 


Subject to the conditions set forth in the Warrant
Agreement, the Warrants may be exercised only during the Exercise Period and to the extent not exercised by the end of such Exercise Period,
such Warrants shall become void. The Warrants may be redeemed, subject to certain conditions, as set forth in the Warrant Agreement.


 


Reference is hereby made to the further provisions
of this Warrant Certificate set forth on the reverse hereof and such further provisions shall for all purposes have the same effect as
though fully set forth at this place.


 


This Warrant Certificate shall not be valid unless
countersigned by the Warrant Agent, as such term is used in the Warrant Agreement.


 


[signature page follows]


 






     


     


    

 


This Warrant Certificate shall be governed by and
construed in accordance with the internal laws of the State of New York, without regard to conflicts of laws principles thereof.


 


	 	METAL SKY STAR ACQUISITION CORPORATION
	 	 
	 	By:	 


 


	 	Name:	 


 


	 	Title:	 


 


	 	VSTOCK TRANSFER, LLC, as Warrant Agent
	 	 
	 	By:	 


 


	 	Name:	 


 


	 	Title:	 


 


[Form of Warrant Certificate]


 


[Reverse]


 


The Warrants evidenced by this Warrant Certificate
are part of a duly authorized issue of Warrants entitling the holder on exercise to receive Ordinary Shares and are issued or to be issued
pursuant to a Warrant Agreement dated as of ____________, 2021 (the “Warrant Agreement”), duly executed and
delivered by the Company to VStock Transfer, LLC, a New York limited liability company, as warrant agent (the “Warrant Agent”),
which Warrant Agreement is hereby incorporated by reference in and made a part of this instrument and is hereby referred to for a description
of the rights, limitation of rights, obligations, duties and immunities thereunder of the Warrant Agent, the Company and the holders (the
words “holders” or “holder” meaning the Registered Holders or Registered Holder, respectively)
of the Warrants. A copy of the Warrant Agreement may be obtained by the holder hereof upon written request to the Company. Capitalized
terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement.


 


Warrants may be exercised at any time during the
Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate may exercise them by
surrendering this Warrant Certificate, with the form of election to purchase set forth hereon properly completed and executed, together
with payment of the Exercise Price as specified in the Warrant Agreement (or through “cashless exercise” as provided for in
the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any exercise of Warrants evidenced
hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced hereby, there shall be issued to the
holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number of Warrants not exercised.


 


Notwithstanding anything else in this Warrant Certificate
or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a registration statement covering the Ordinary
Shares to be issued upon exercise is effective under the Securities Act and (ii) a prospectus thereunder relating to the Ordinary
Shares is current, except through “cashless exercise” as provided for in the Warrant Agreement.


 






     


     


    

 


The Warrant Agreement provides that upon the occurrence
of certain events the number of Ordinary Shares issuable upon exercise of the Warrants set forth on the face hereof may, subject to certain
conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would be entitled to receive a fractional interest in an Ordinary
Share, the Company shall, upon exercise, round down to the nearest whole number of Ordinary Shares to be issued to the holder of the Warrant.


 


Warrant Certificates, when surrendered at the principal
corporate trust office of the Warrant Agent by the Registered Holder thereof in person or by legal representative or attorney duly authorized
in writing, may be exchanged, in the manner and subject to the limitations provided in the Warrant Agreement, but without payment of any
service charge, for another Warrant Certificate or Warrant Certificates of like tenor evidencing in the aggregate a like number of Warrants.


 


Upon due presentation for registration of transfer
of this Warrant Certificate at the office of the Warrant Agent a new Warrant Certificate or Warrant Certificates of like tenor and evidencing
in the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange for this Warrant Certificate, subject
to the limitations provided in the Warrant Agreement, without charge except for any tax or other governmental charge imposed in connection
therewith.


 


The Company and the Warrant Agent may deem and
treat the Registered Holder(s) hereof as the absolute owner (s) of this Warrant Certificate (notwithstanding any notation of
ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the holder(s) hereof,
and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. Neither the
Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a shareholder of the Company.


 


Election to Purchase


 


(To Be Executed Upon Exercise of Warrant)


 


The undersigned hereby irrevocably elects to exercise
the right, represented by this Warrant Certificate, to receive               Ordinary
Shares and herewith tenders payment for such Ordinary Shares to the order Metal sky star Acquisition Corporation (the “Company”)
in the amount of $               in accordance with the terms
hereof. The undersigned requests that a certificate for such Ordinary Shares be registered in the name of               ,
whose address is               and that such Ordinary Shares
be delivered to               whose address is               
.. If said number of Ordinary Shares is less than all of the Ordinary Shares purchasable hereunder, the undersigned requests that a new
Warrant Certificate representing the remaining balance of such Ordinary Shares be registered in the name of               ,
whose address is and that such Warrant Certificate be delivered to               ,
whose address is               .


 


In the event that the Warrant has been called for
redemption by the Company pursuant to Section 6.1 or 6.2 of the Warrant Agreement and the Company has required cashless
exercise pursuant to Section 6.4 of the Warrant Agreement, the number of Ordinary Shares that this Warrant is exercisable
for shall be determined in accordance with subsection 3.3.1 (b) and Section 6.3 of the Warrant Agreement.


 


In the event that the Warrant is a Private Placement
Warrant or a Working Capital Warrant, that is to be exercised on a “cashless” basis pursuant to subsection 3.3.1(c) of
the Warrant Agreement, the number of Ordinary Shares that this Warrant is exercisable for shall be determined in accordance with subsection
3.3.1(c) of the Warrant Agreement.


 


In the event that the Warrant is to be exercised
on a “cashless” basis pursuant to Section 7.4 of the Warrant Agreement, the number of Ordinary Shares that this
Warrant is exercisable for shall be determined in accordance with Section 7.4 of the Warrant Agreement.


 






     


     


    

 


In the event that the Warrant may be exercised,
to the extent allowed by the Warrant Agreement, through cashless exercise (i) the number of Ordinary Shares that this Warrant is
exercisable for would be determined in accordance with the relevant section of the Warrant Agreement which allows for such cashless exercise
and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably elects to exercise the right, represented
by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement, to receive Ordinary Shares. If said number
is less than all of the Ordinary Shares purchasable hereunder (after giving effect to the cashless exercise), the undersigned requests
that a new Warrant Certificate representing the remaining balance of such Ordinary Shares be registered in the name of               ,
whose address is               and that such Warrant Certificate
be delivered to               , whose address is               
..


 


[Signature Page Follows]


 


Date:               ,
20__


 


	 	 
	 	(Signature)
	 	 
	 	 
	 	 
	 	 
	 	(Address)
	 	 
	 	 
	 	(Tax Identification Number)
	 	 
	Signature Guaranteed:	 
	 	 
	 	 


 


THE SIGNATURE(S) SHOULD 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) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED).