... 3.Usage:cut and polish granite,marble,glass,concrete,ceramic diamond grinding disc1.Dimensions:1) Diameter: 100mm;2)Thickness:0.8 ... ) Hole size: 16mm,20mm,special hole size is accepted.2. Diamond grit: 40 - 120 available.3. Coating: nickel, chrome, titanium available ... ; 4. Keep the competition power in the market:the UnitedStates,Europe,Japan,Hongkong,Southeast Asia;5. The products own longer service ...