10PCS 6mm Diamond Coated Hole Saw Drill Bits for Glass Ceramic Tile Marble Rock Porcelain (6mm)

1. Designed for drilling 6mm diameter holes. 2. Nickel-plated hole saw drill bit with a diamond dust coating offers superior performance and cutting strength. 3. Cut clean and round holes to a depth of approximately 30mm. 4. Excellent for making clean and accurate hole on glass, tile, porcelain, marble and other fragile materials. 5. Always use lubrication (water), otherwise the diamond coated drill bit will burn. 6. Start your hole diagonally, make a round trace and then hold drill straight. 7. Works better with an electric drill (Excluding in this item).