To grind hard brittle fragile things like glass, ceremics, stone etc. Sharp, long life, hard wearing, no peel off good price Jiu Feng Diamond Tools CO., LTD Quality First, Honesty, Seeking for Perfection, Reliability 1. Specifications Head shapevarious choicesGrit36# 46# 80# etcBody length20mm etcMaterial65Mn& corundum 2. ApplicationsTo grind hard brittle fragile things like granite, marble, ...