1 .Insert a core drilling bit into your drill motor. Do not use a masonry bit. They are not strong enough to adequately drill through granite.
2 .Place a white bottle cap--one you would find on a medicine bottle--over the area on the granite where you will drill. The cap opening must face up.
3.Press a plumber's putty around the base of the medicine cap. The putty will hold the cap in place and form a damn around the cap.
4. Pour any type of oil into the cap up to 1/4 inch from the top. The putty will keep the oil from leaking out onto the granite.
5.Position the drill bit inside the cap with oil and begin to drill. Let the drill spin for 10 seconds, then allow the drill to sit in the oil and cool down for 10 seconds.
6.Continue drilling for 10 seconds and cooling down for 10 seconds. Alternate the procedure until you've drilled through the granite.