Features: Rustless, cuts quickly: Nickel-plated with a diamond dust coating offers-superior performance and cutting strength. Extended service life. These diamond drill bits are excellent for making a clean and accurate hole. Sharp-& smooth cut: High quality, good performance, long life-excellent for making a clean and accurate hole. All the bits are processed for a smooth and exact finish. Small resistance: Small incision resistance, opening speed is quick, easy removal of chips and other advantages. Also, it helps to open accurately. Large chip holes to ensure that when the punching smooth, punching accurately. Ideal-for: This diamond coated core drill bit removes a complete circle from glass, marble, tiles, granite, ceramic or other. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. Application: Drill glass, tile bottles, blocks-jars, fiberglass-porcelain tile ceramic, slate mable, granite light stone. Excellent for making them clean and accurate hole on glass and tile. Specifications: Material: Metal Size:Approx.6-32mm Size:Approx.6-30mm Color:Silver Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 10pcs Diamond Hole Saw