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Diamond drill bits are perfect for drilling holes through hard materials such as these: Glass, sea glass, beach glass, fused glass Stone, gemstones, rock, pebbles. Ceramic, porcelain, tiles, glazed pottery, plates. Features: This diamond bit core drilling removes a complete circle glass, tiles, marble, granite, ceramic or other material and only needs water for lubrication Can be used with a standard electric drill (not included) Easy to use, high quality, good performance, long life Excellent for making clean and accurate hole on glass, tile and marble Always use lubricant (water), otherwise the diamond core drill will burn Specification: Type: Diamond Coated Hole Saw Drill Bits Material: Steel + Diamond Sand Production Process: Electroplating Color: Silver Sizes: 6/8/10/12/14/16/18/20/22/25/28/30/35/40/45/50mm Using Steps: Step 1: Clean the surface and mark down the position of the drill hole, angle drill 45 degrees to start the hole slowly. Step 2: Keep wet with water. Step 3: Being drilling at low speeds. Angle drill to vertical position once the hole has appeared. Step 4: Slow speed down to drill the hole off and for the exit hole to prevent a breakthrough. Package Includes: 15Pcs Hole Saw Drills 15Pcs 6mm Holesaw