XIANQI Hole Diameter: 60mm; Material: Metal, Diamond Particles, Diamond coating maximizes performance and retains a sharper cutting edge than traditional carbide or bimetal hole saws. This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, cer Hole Diameter: 60mm; Shank Diameter: 10mm (3/8"); Total Length: 55mm Nickel plating on these bits maximizes your tools life with great resistance to corrosion. Side holes allow for easy slug removal after drilling, Perfect set for cutting accurate holes in a wide variety of materials such as glass and ceramics. Applicable Industry: Suitable for Stone, Tiles, Ceramics, Glass and Granite, etc Processing Can be used with a standard electric drill (not included) Easy to use, high quality, good performance, long life Start your hole diagonally, make a round trace and then hold drill straight Specification: Hole Diameter: 60mm (2-3/8 inch) Shank Diameter: 10mm (3/8") Total Length: 55mm (2-3/16") Quantity: 1 Piece Tips: Electroplated diamond coating will wear off if the tool gets too hot. Never let your drill bit run dry. Please add water for coolant and drill slowly. start drill at 45 Degree to surface and align to 90 Degree as hole forms. Never use drills while machine is in hammer action. Holes Require No Further Work As Cutting Is Clean.