2Pcs 24mm Diamond Coated Hole Saw Drill Bits SERRATED TEETH SHARP for Glass Tile Ceramic Marble Granite The diamond coated hole saw suitable for use in drill hole on glass, marble, tile or granite Product Specification: Please choose from the drop down menu which size best qualifies your need. Available External Diameter as below: Hole Diameter:24mm External Diameter:24mm Internal Diameter:21.7mm Shank Diameter:8mm Rim Thickness:1.2mm Total Length:52mm Drilling Depth:22mm Quantity:Total 2 Pieces Head Style: Serrated Teeth Drilling speed: Drill a Holes In Seconds, VERY SHARP Use with water as a lubricant Quick Tips 1. Please add water for coolant and drill slowly 2. start drill at 45 Degree to surface and align to 90 Degree as hole forms 3. Never use drills while machine is in hammer action. 4. Holes Require No Futher Work As Cutting Is Clean We Can List Any Size & Amount Of This Product: Hole diameter from 5mm - 100mm