10Pcs 6-30mm Diamond Coated Drill Bit Tile Parts Set Granite Marble Glass Ceramic Drill Bit Diamond Core Drill Power ToolsFeature:10pcs Diamond Glass Drill Bit, Ceramic Tile Hollow Core Opener, Removal Tool. Coated core drill bits can remove complete circle from glass, tile, marble, granite, ceramics or other materials. Nickel-plated diamond dust-resistant coating provides excellent cutting performance and durability. During construction work, only water lubrication is required. The holes are neatly opened, no folding edge, no shaking, low cutting resistance, fast hole opening speed, easy chip removal, etc. You can choose from 10 sizes. Specification: Material: high quality steel, diamond anti-dust coatingHole Specification: 6mm, 8mm, 10mm, 12mm, 15mm, 16mm, 18mm, 20mm, 22mm, 30mmQuantity: 10 piecesApplication: it is widely used for hole opening operations, such as glass, ceramic tile, marble, granite, ceramic, gypsum board, etc. Note:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow 1-2mm measuring deviation due to manual measurement.10 X Hole Openers