for grinding and polishing hard brittle things like ceramics, teeth, glass, granite and marble etc ... materialcorundum & MnGrit20# /80#Handle diameter2mmHead shaperound,square Specialtyallotype2. ApplicationsTo cut hard brittle fragile things like granite, marble, ceramics, tiles, bricks, FRP ... can be customized according to customers' requirements.Size27#-80#. Hot Sale 30PC Diamond Mounted Points