Diamond coated on the top and sides with a square flat edge, these 120 grit electroplated diamond burrs are mounted on a 3mm (1/8") shank. 

It is suitable for shaping, carving, and grinding various materials, such as glass, stone, jade, slate, and very hard wood. 

Use in your pendant motor or a handheld rotary tool such as a Dremel. Use wet to prevent overheating, to achieve a clean cut, and to extend the life of the burr.