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    question

    What would you use to enlarge a 1/2 hole to 7/8 inch on the back of the sink for a hand sprayer ?
    Would you use a grinder and do they make a conical shaped to do it ?
    - John I

    answer

    if its a metal sink then 7/8 x 6 inch with a 1/2 HSS bit.

    1/2" Shank Drills

    If it is a porcelain sink the 7/8 x 6 carbide tipped bit with a 1/2 shank

    Hex Shank Hammer Drills
    - John
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