diamond tool smooth and sharpen surface fast and efficient grinding insrument Specification:Diameter 40MM Mesh :400# 600# Jiu Feng Diamond Tools CO., LTD Quality First, Honesty, Seeking for Perfection, Reliability 1. Specifications matrix / body65MnGrit36# 46# 80# etcDiametercustombondmetal 2. Applicationsused in ceramic, glass, ferrite, semiconductor, stone and other hard brittle materials ...