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How can I drill a hole in a granite worktop?

I have granite worktop in my kitchen and I need to drill a 12mm diameter hole in to add a tap. What type of drill should I use?
Martin Osborne, April 2007
http://www.eternaltools.com/viewproducts.asp?txtRangeID=39&txtCategoryID=37&txtCategoryTitle=Diamond%20Core%20Drill%20Bits

Big Softy, May 2007