... also for repairing, grinding, polishing, crystallizing millstones.floor grinder heavy duty HWG 70 has the quickest motor speed, from 300 rpm ... area is 700 mm, so it is most powerful machine in HONWAY grinding and polishing equipments. It is good ... , preparation, maintenance.2, Polish concrete, marble, granite, terrazzo with various grit of diamond metal, resinbond.3, Remove painting, coating ...