Diamond drill bit set 5/6/8/10/12mm, diamond coated drill bit set for tile, marble, glass Description: 1. High Rigidity Diamond This tile hole saw is made of industrial grade carbon steel with a nickel plated body that resists corrosion. Thick corundum coating on top provides superior cutting resistance for maximum drilling results. 2. Extremely Sharp Each drill bit has been treated with a smooth and exact finish which lowers the incision resistance and drilling pressure, increases the sharpness and the use of the water lubrication. Excellent for making clean, precise holes on glass or ceramics and dramatically extending bit life. 3. Large Clearance Hole These ceramic drill bits with a large clearance hole make it easy for cooling water to enter and chips to escape. Make the drilling process easier and more relaxing. 4. Widely Application There are 10 different sizes included with this glass drill set to meet various demands. Perfect for drilling glass, tile bottles, block jars, fiberglass, porcelain, ceramic tile, glazing, brick and stone. Specifications: Model: 5-12mm Production Process: Plating Color: Silver Product Type: 5mm/6mm/8mm/10mm/12mm Suitable: Glass, Ceramic, Tile, Marble, etc. Package Included: 5 x Tool Drill Bits diamond