[15 SIZES]: Total 15 different sizes (6/ 8/ 10/ 12/ 14/ 16/ 18/ 20/ 22/ 25/ 26/ 28/ 30/ 40/ 50 mm).

[SMALL RESISTANCE]: Small incision resistance, opening speed is quick, easy removal of chips and other advantages. Also, help to open accurately. Large chip holes to ensure that when the punching is smooth, punching is accurate.

[DURABLE]: Nickel-plated with a diamond dust coating offers superior performance and cutting strength. Extended service life. These diamond drill bits are high quality and have good performance that excellent for making clean and accurate holes.

[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 Concrete or for depths beyond about 1/2".