4 1/2 Inch Diamond Hole Saw Diamond Tipped Porcelain Tile Ceramic Glass 4.5 Inch Hole Saw Drill Bit Standard Shank Easy To Use by DRILAX 4 1/2" Diamond Coated Hole Saw Drill Bit. You will get a perfect 4.5 inch hole through some really tough material. Right size for drilling a hole through tiles for new toilet. Cuts Through Ceramic, Porcelain, Glass, Marble, Granite Wet Type. Do not use dry. Pour water orbuilt a dam around the cutting area with plumbers putty and fill it with water Drills 1 inch deep. There is no need for a Pilot Drill Bit. Pilots are not safe for glass.