[10 SIZES]: Total 10 different sizes ( 6mm, 8mm, 10mm, 14mm, 16mm, 18mm, 22mm, 35mm, 40mm, 50mm) [SMALL RESISTANCE]: Small incision resistance, opening speed is quickly, easy removal of chips and other advantages.Also help to open accurately. Large chip holes to ensure that when the punching smooth, punching accurate. [DURABLE]: Nickel-plated with a diamond dust coating offers superior performance and cutting strength.Extended service life.This diamond drill bits are high quality and good performance that excellent for making clean and accurate hole. [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. [TIP]: Can be used with a standard electric drill (not included) When you using the diamond drill bits, please use lubrication (water),otherwise the diamond core drill will burn.Not for use on
