1)diamond wheel for stone 2)core with hole ensure good cool systerm 3)good warrenty 4)high quality and long service life Diamond grinding wheel1.Fast & Aggressive Removal with a Smooth Finish2.Single & double grinding wheel3.Wet grinding4.high quality, good price,long grinding life5.diamond wheel for stone6.core with hole ensure good cool systerm7.good warrenty8.high quality and long service ...