1.These diamond drill bits are made of industrial grade carbon steel, and the top thickened diamond coating provides excellent cutting strength.
2.The hardness diamond saw has a smooth and exact finish that lower the incision resistance and drill pressure, increases the sharpness.
3.The glass hole saw helps the entry of cooling water and the escape of chips and other particles from the borehole. Make the drilling process easier.
4.Ideal for making clean and precise holes in glass or ceramics and extending the life of the drill.
5.Suitable for drilling glass, tiles and stone.

Note:
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".

Q1:Which third party verified you?
A1:ISO9001

Q2:How many pieces are there per packet?
A2:Usually 100 pieces per packet,but it depends on your specific style.