I have never done it thru granite, but my guess would be a very sharp drill bit that would be cooled with h20, then use machine screws, nuts and lock washers with a rubber pad or plumbers putty to protect the granite from scratching. use stainless hardware to avoid rusting, as you know there will be spills. hope this helps, good luck
Mark
From the land of pleasant living, the Chesapeake bay
Mark
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