Osko&reg; 3 Pcs Diamond Drill Bit Set 1-1/2" , 1-3/4" , 2" for Ceramic, Porcelain Tiles, Glass, Fish Tanks, Marble, Granite, Quartz, Lot 3 Diamond Coated Hole Saws- Kitchen, Bathroom, Shower, Faucet 45# Steel Base and Type 3 Diamond,For porcelain, glass, marble, ceramic, rock and granite Bit Set 1-1/2" , 1-3/4" , 2",Shank Size 3/8" - suitable for all common electric drillers. High quality set is ideal for drilling clean and accurate holes.Use with standard electric or batter With Special design of diamond brazing, the edge of saw blade will be free cutting.There is no need Do NOT run dry. Diamond Coated Tools will work best if you use water to keep the tools cool.