Another thing you need to take note is, keep putting water on the tiles when you drill the hole, this is what my grill installer did, and the hole really superb nice without any damaging, I did take some photo during his installation and drilling the hole, he just use a mineral water bottle, make a hole on the cap then keep press the bottle to split out the water towards the place he want to drill, he told me that by putting water, the drilled hole will be very smooth (no crack rounding) due to some tribology facts

This post has been edited by leeyung: Dec 12 2011, 05:21 PM