... grinding sharp, high, the advantages of small noise, and the holes do not produce the tremor, clean, smooth ... Application: glass, Ceramics,cameo, stone, agate, sheel, tile and other hard materials4.Complete specification: Straight shank, Taper shank , ... 1-15 Days according to the quantity10.Package:Standard export package: Manufacturer of taper shank glass diamond drill bit with competitive price