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 to use. 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: 100% Brand New 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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }