【EXTREME HARD 】These diamond drill bits are made of industrial grade carbon steel with nickel-plated coated body to resist corrosion. A thicken diamond coating on the tops offers superior cutting strength for maximum drilling outcomes.
【EXTRAORDINARY SHARP】Each diamond hole saw has a smooth and exact finish that lower the incision resistance and drill pressure, increases the sharpness, and effectiveness of water lubrication. Excellent for making clean and precise holes on glass or ceramic and considerably extending drill bit life.
【LARGE CLEARANCE HOLE】These glass hole saw set along the drill bit facilitate the entrance of cooling water and escape of chips and other particles from drilling. Makes the drilling process easier.
【WIDE USAGE】 15 different drill bits included with this glass drill bit set to meet various demands. Drilling holes for Glass, Tile Bottles, Blocks Jars, Fiber Glass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone (especially for glass and tile).
【15 SIZES】15 Sizes: 6mm/0.24", 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.63", 18mm/0.71", 20mm/0.79", 22mm/0.86", 25mm/0.98", 26mm/1.02", 28mm/1.1", 30mm/1.18", 40mm/1.57", 50mm1.97". The product is installed on a professional drill or electric drill, bench drill. Rpm 800-1000 rpm or so, you must add water cooling holes during operation.