Drilax&trade; 4-7/8" Diamond Drill Bit Hole Saw (Smaller Than 5 ") Ceramic, Porcelain Tiles, Glass, Fish Tanks, Marble, Granite, Quartz Diamond Coated Circular Saw - Kitchen, Bathroom, Shower, Faucet Wet Drilling Tool 4 7/8 Inches in Drilax010125 Durable Diamond Drilling Holesaw Tool 4 7/8" - Slightly Smaller Than 5 inches Rare Size. Use with standard electric or battery drillers. There is no need for a center pilot drill. These tools do not have center pilot drills. Do NOT run dry. Diamond Coated Tools will work best if you use water to keep the tools cool. Shank size is 3/8" - suitable for all common electric drillers.