Unassociated Document


    LOCK
      UP AGREEMENT

    


    This
      Lock
      Up Agreement (the "Agreement") is made as of the 21st day of
      December, 2007, by the signatories hereto (each a "Holder"), in connection
      with
      his ownership of shares of Sentra Consulting Corp., a Nevada corporation (the
      "Company").

    


    NOW,
      THEREFORE, for good and valuable consideration, the sufficiency and receipt
      of
      which consideration are hereby acknowledged, Holder agrees as
      follows:

    


    1. Background.

    


    a.
       Holder
      is
      the record and beneficial owner of the amount of shares of the Common Stock
      of
      the Company (“Common Stock”) designated on the signature page
      hereto.

    


    b. Holder
      understands that, as a condition to receiving the Common Stock in exchange
      for
      the Holder’s membership interests in Karat Platinum, LLC pursuant to the terms
      and provisions of the Share Exchange Agreement dated as of the date hereof
      (the
“Exchange Agreement”; capitalized terms used herein not otherwise defined shall
      have the meanings ascribed to such terms in the Exchange Agreement) among the
      Company, Karat Platinum, LLC and the Holders, the Company has required, and
      Karat Platinum has agreed to obtain, an agreement from each Holder to refrain
      from selling any securities of the Company for two years from the Closing Date
      (the "Restriction Period"). 

    


    2. Share
      Restriction.
      

    


    a. Holder
      hereby agrees that during the Restriction Period, Holder will not,
      directly or indirectly, offer, sell, assign, gift, transfer, grant a
      participation in, pledge, or otherwise dispose or Encumber or agree to dispose
      or Encumber in any manner any share of Common Stock. Any
      attempt by a Holder to transfer or Encumber any of its Common Stock in violation
      of the terms of this Agreement shall be void and ineffective. Holder further
      agrees that the Company is authorized to and the Company agrees to place "stop
      orders" on its books to prevent any transfer of shares of Common Stock or other
      securities of the Company held by Holder in violation of this
      Agreement.

    


    b. Any
      subsequent issuance to and/or acquisition of shares or the right to acquire
      shares by Holder during the Restriction Period will be subject to the provisions
      of this Agreement.

    


    c. Notwithstanding
      the foregoing restrictions on transfer, the Holder may, at any time and from
      time to time during the Restriction Period, transfer the Common Stock (i) as
      bona fide gifts or transfers by will or intestacy, (ii) to any trust for the
      direct or indirect benefit of the undersigned or the immediate family of the
      Holder, provided that any such transfer shall not involve a disposition for
      value, (iii) to a partnership which is the general partner of a partnership
      of
      which the Holder is a general partner, provided,
      that,
      in the case of any gift or transfer described in clauses (i), (ii) or (iii),
      each donee or transferee agrees in writing to be bound by the terms and
      conditions contained herein in the same manner as such terms and conditions
      apply to the undersigned. For purposes hereof, "immediate family" means any
      relationship by blood, marriage or adoption, not more remote than first
      cousin.

    


    3. Miscellaneous.

    


    a. At
      any
      time, and from time to time, after the signing of this Agreement Holder will
      execute such additional instruments and take such action as may be reasonably
      requested by the Company to carry out the intent and purposes of this
      Agreement.

     

    
      
        
        

      

      
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    b. This
      Agreement shall be governed, construed and enforced in accordance with the
      laws
      of the State of New York without regard to conflicts of laws principles that
      would result in the application of the substantive laws of another jurisdiction,
      except to the extent that the securities laws of the state in which Holder
      resides and federal securities laws may apply. Any proceeding brought to enforce
      this Agreement may be brought exclusively in courts sitting in New York County,
      New York.

    


    c. This
      Agreement contains the entire agreement of the Holder with respect to the
      subject matter hereof. The Board of Directors of the Company, in its sole
      discretion, can amend the provisions of this Agreement, upon the approval of
      80%
      of the members of the Board. 

    


    d. This
      Agreement shall be binding upon Holder, its legal representatives, heirs,
      successors and assigns.

    


    e. This
      Agreement may be signed and delivered by facsimile and such facsimile signed
      and
      delivered shall be enforceable.

    


    f. The
      Company and Holder agree not to take any action or allow any act to be taken
      which would be inconsistent with this Agreement nor to amend or terminate this
      Agreement.

    


    g. The
      current officers and directors of the Company are third party beneficiaries
      of
      this Agreement, with right of enforcement.

    


    IN
      WITNESS WHEREOF, and intending to be legally bound hereby, Holder has executed
      this Agreement as of the day and year first above written.

     

    
      	 	 	 
	 	HOLDER:
	 	 
	 	 (Signature of Holder)
	 	 
	 	 
	 	 (Print Name of Holder)
	 	 
	 	 
	 	Number of Shares of Common Stock
              Owned
	 	 
	 	 COMPANY:
	 	 SENTRA CONSULTING
              CORP.
	 	 
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

            


    

     

    
      
        
        

      

      
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