diamond drill bit: HP, medium, diamond coated for grinding, engraving, carving on metal, wood, bone, jade, PVC, glass, stone Catalog:Description:1 ... optimal working results;2. Ideal for shaping and gross reduction, work great on PFM, chrome & ceramic materials;3. Also for ... metal, wood, bone, jade, PVC, glass and stone carving, can be used as glass drill bit, diamond drill bit, jewelry drill bit and ...