... Bits: 1.Size:10mm-160mm 2.In thread 3.Spray paint on the surface 4.Used for glass,ceramic,marble,granite etc ... ).Diamond grit:60 - 80, or upon request. 2. Colour:Spray paint on the surface of drill 3. Smooth drilling surface, high drilling ... , such as marble, granite, glass, ceramic, hard materials and so on. 5.Special design can be accepted. Advantages of Jingling:1 ...