This Busch Diamond Tapered Point Burr has a medium grit and this burr has a 2.35mm shank that fits most pendant drills and micromotors. The Busch diamond tapered point burr is designed to cut through hard materials such as glass and stone. The diamond coating provides effective cutting power for grinding hard materials such as glass and stone. To maximise the longevity and effectiveness of this product, regularly dip the burr in water when using. This will also help collect dust when grinding hard materials.