Drilax 1 Inch Diamond Hole Saw Drill Bit Tiles, Glass, Fish Tanks, Marble, Granite Countertop, Ceramic, Porcelain, Coated Core Bits Holesaw DIY Kitchen, Bathroom, Shower, Faucet Installation Hole Size 1" HIGH QUALITY, DURABLE Diamond Coated Holesaw Tool 1 inch Diameter STANDARD 3/8 inch Shank Use with and standard electric or battery drill. PROFESSIONAL Quality Tool for Drilling Holes in Tiles, Glass, Fish Tanks, Marble, Granite Countertop, Ceramic, Porcelain SAVE OVER 80 Percent for DIY Kitchen, Bathroom, Shower, Faucet Installation Projects Use water as coolant to prolong the tool life, these tools do not need a center pilot drill.