Hollow Core Drill Bit Set for Ceramic, Glass, Porcelain Tile Diamond Drilling Tools Hole Drilling DrillOOTDTs: Made of hard metal and diameter with corrosion resistance and . The diamond hole saw has been processed by a smooth and fine finish, which reduces the drag force to a minimum, increases the sharpness to drill precise holes in seconds. Diamond drill bits start the hole diagonally, make a circular braid, and then hold the drill straight. Water is required for lubrication during drilling. Widely used for drilling glass, tile bottle, ceramic tile, brick, stone, granite and so on. The 10/15/16 pcs set meets most of your different needs. Timely customer support can help you resolve all customer complaints. Specification: Material: DiamondSize:10pcs/set: 6mm/0.24 inch, 8mm/0.31 inch, 10mm/0.39 inch, 12mm/0.47 inch, 14mm/0.55 inch, 16mm/0.63 inch, 18mm/0.71 inch, 20mm/0.79 inch, 22mm/0.87 inch, 30mm/1.18 inch15pcs/set: 6mm/0.24 inch, 8mm/0.31 inch, 10mm/0.39 inch, 12mm/0.47 inch, 14mm/0.55 inch, 16mm/0.63 inch, 18mm/0.71 inch, 20mm/0.79 inch,22mm/0.87 inch, 25mm/0.98 inch, 26mm/1.02 inch, 28mm/1.1 inch, 30mm/1.18 inch, 40mm/1.57 inch, 50mm/0.20 inch16pcs/set: 6mm/0.24 inch, 8mm/0.31 inch, 10mm/0.39 inch, 12mm/0.47 inch, 14mm/0.55 inch, 16mm/0.63 inch, 18mm/0.71 inch, 20mm/0.79 inch,22mm/0.87 inch, 25mm/0.98 inch, 28mm/1.1 inch, 30mm/1.18 inch, 35mm/1.38 inch, 40mm/1.57 inch, 45mm/1.77 inchPackage Included: 1 Set Diamond Drill BitNote: 1. Please allow 0-1cm error due to manual measurement. Pls make sure you do not mind before ordering.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!