... ,polish the crystallize granite,marble,terrazzo,and concrete etc. Floor concrete grinder TypeMRK-350BWeight(kg)105Work area340mmWork depth0-0.5mmSpeed ... (rpm)680rpmMotor typeEntire sealed fan-shapedMotor power2.2KW/3.0KW*4PMotor voltage380V/220VMotor power ... concrete2.Wipe off paint,seal layer3.durable in grinding floor,rain trace,trowel trace,rough surface ...