15Pcs Diamond Hole Saw Drill Bit Set

Remove a perfect complete circle from glass, tiles, marble, granite, ceramic, and other materials with this amazing 15 piece set. Extremely easy to operate and only needs a little amount of water for lubrication. For perfect results, simply start your hole diagonally, make a round trace, then hold the drill straight as you cut through the material. It’s never been this easy! Features: Can be used with standard electric drill Material: steel Quantity: 15 pcs Bits Size: 6 - 50mm/0.23"-1.97", 6mm/0.23", 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.62",  18mm/0.7", 20mm/0.79", 22mm/0.87", 25mm/0.98", 26mm/1.02", 28mm/1.10", 30mm/1.18", 40mm/1.57", 50mm/1.97" Features: Stable Quality, no broken edges. Good concentricity without produce tremor phenomenon. Equipped with a fast hole speed. Powder and nickel bonding strength. High wear resistance Instructions for use: When using, keep constant temperature, uniform speed, keep continuous water supply, prevent overheating Always use lub