... 3.Fast drilling speed Good quality Diamond Taper Shank Drill Bit for glass introduction:Diamond Taper Shank Drill Bit : using high quality ... , sheel, tile and other hard materials4.Complete specification: Straight shank, Taper shank ,thread shank. Special specification can be made according to ... to the quantity10.Package:Standard export package: Good quality Diamond Taper Shank Drill Bit for glass