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The standard size hole for kitchen faucets is generally 1-3/8” in diameter. Manufacturers will list what size holes the faucet fits as there can be some variation. If your counter or sink ledge is pre-drilled with faucet holes, measure them and check on the faucet manufacturer’s manual to ensure the faucet will fit in the holes. If you are installing a new sink or counter that needs holes drilled, drill holes in the size the faucet calls for in order to get a proper fit.