Drilax 3-1/2 Inch Diamond Hole Saw Glass Drill Bit Diamond Coated Drilling Holesaw Tool 3 1/2" - Larger Than 3 inches - Smaller Than 4 Inches Cuts Through Ceramic and Porcelain Tile - Glass, Marble, Granite Use with Any Electric Drill - Diamond Circular Hole Saw for Floor Drain, Shower, Shower Mixing Valve, Shower Drain Installation Drills 1 inch deep - Wet Type - Do not use dry - No Pilot Drill Bit - Pilots are not required Cylindrical Shank 3/8" - No Need for Adapters or Arbor