5/6/8/10/12 mm diamond drill bit set, diamond coated drill bit set, suitable for ceramic tiles, marble, glass. Description: 1. High Rigidity Diamond: This tile hole saw is made of industrial carbon steel with a nickel-plated body that resists corrosion. The thick corundum coating on top provides superior cutting power for maximum drilling results. 2. Extremely Strong: Each drill bit has been treated with a smooth and precise finish that lowers cutting resistance and drilling pressure, increases sharpness, and eliminates the need for water lubrication. Excellent for making clean and precise holes in glass or ceramics and significantly extends the life of the drill bit. 3. Large Clearance Hole: These ceramic drill bits with a large clearance hole facilitate the penetration of cooling water and the discharge of chips, making the drilling process easier and more relaxing. 4. Wide Application: This glass drill bit set includes 10 different sizes to meet various needs. Perfect for drilling glass, tile bottles, block jars, fiberglass, porcelain, ceramic tiles, glazing, brick, and stone. Specifications: Model: 5-12 mm Production process: Plating Color: Silver Product type: 5 mm / 6 mm / 8 mm / 10 mm / 12 mm Suitable for: Glass, ceramics, tiles, marble, etc. Package includes: 5 x diamond tool drills