... grinding insrument Specification:Diameter 40MM Mesh :400# 600# Jiu Feng Diamond Tools CO., LTD Quality First, Honesty, Seeking for Perfection, ... corundum; no inconsistant with concerning data, like lenth.Since diamond tool is consuming in using, there is no warranty ... sphere shaped grinding head umbrellar shaped grinding headvarious head-shape diamond grinding head 5. Please feel free to contact us. ...