10Pcs/Set Diamond Coated Core Drill Bit 3~50mm Hole Saw for Tile Ceramic Glass Porcelain Marble Features: The diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and only needs water for lubrication. Comes with different sizes for multiple purposes. Can be used with a standard electric drill. Made from premium metal with diamond coating, it is of high hardness, wear-resistant and durable in use. Easy e. Just start your hole diagonally and make a round trace and then hold drill straight. Always use lubrication (water), otherwise the diamond core drill will burn.   Specifications: Condition: Material: Metal with Diamond Coating Open Hole Size: 3mm/0.12in, 4mm/0.16in, 5mm/0.20in, 6mm/0.24in, 8mm/0.31in, 10mm/0.39in, 12mm/0.47in, 18mm/0.71in, 32mm/1.26in, 50mm/1.97in Total Length: Approx. 5cm/1.97in Quantity: 10pcs Weight: Approx. 154g   Package Included: 10 * Diamond Coated Hole Saw Drill Bits Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.