stone grinding machine grind,polish and crystallize Granite,Marble ,Terrazzo and ,Centralized control ,easily operation stone grinding machineTypeGrinder GE-520BVoltage220V Power5.5hpRPM0-1500Work width270*520Work depth0 ... , Aluminum alloy gearbox , open model. 4.Centralized control ,convenient operation.5.It can also grind ,polish new and existing concrete floor ...