To enlarge the hole in metal, marble,granite, bone, tiles, ceramics, asphalt, bricks etc. hard material sharp,long life no chip Jiu Feng Diamond Tools Quality First, Honesty, Seeking for Perfection, Reliability1. Specifications Grit85#Blade materialcorundum & Mnspecialty chip freeLength35mm2. ApplicationsTo enlarge the hole in metal, marble,granite, bone, tiles, ceramics, asphalt, bricks etc. ...