1.Glass Cutting Diamond Drill Bits 2.Sharp,wear-resisting 3.Not jumping edge 4.Long service life 5.Good ... do not produce the tremor, clean, smooth, no broken edge, wear-resisting won't crack edge, high efficiency, long service life, need ... -5000 holes/pc2.Main Market: Europe market.3. Application: glass, Ceramics,cameo, stone, agate, sheel, tile and other hard materials4.Complete ...