... grinding concrete floor, and stone renew and crystallization.marble floor polishing machine HWG 78 has planet disc plates, counter rotate, grind ... concrete, marble, granite, terrazzo with various grit of diamond metal, resin bond;2,Remove painting, coating, epoxy, urethane, glue, polyurethane, ... 7.5KW) Voltage 220/380/460V Hertz 50/60HZ Main Plate speed 50-400rpm Samll Plates speed 300-1750rpm Work Area ...