... , but also for repairing, grinding, polishing, crystallizing millstones.concrete buffing machine HWG 70 has the quickest motor speed, from 300 ... .2, Polish concrete, marble, granite, terrazzo with various grit of diamond metal, resinbond.3, Remove painting, coating, epoxy, urethane, glue, ... 1000*900*700mm The rotation way of concrete buffing machine HWG 70: The diamond tools to be chosen: The effect of ...