diamond coating bur: HP, medium, diamond coated for grinding, engraving, carving on metal, wood, bone, jade, PVC, glass, stone Catalog:Description:1. Most modern galvanisation process, safe and lasting diamond coating, optimal working results;2. Ideal for shaping and gross reduction, work great on PFM, chrome & ceramic materials;3. Also for grinding and engraving on metal, wood, bone, jade, PVC, ...