Drilax&trade; 2-3/4" Diamond Drill Bit Hole Saw for Kitchen, Bathroom, Shower, Faucet Wet Drilling Tool Ceramic, Porcelain Tiles, Glass, Fish Tanks, Marble, Granite, Quartz Diamond Coated Circular Saw 2.75 Inches in 2 3/4 " Drilax010070 Durable Diamond Drilling Holesaw Tool 2 3/4" - 2.75 inches Over 80% cost savings compared to big box stores. 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.