... concrete floor polishing machine HWG 78 has the quickest motor speed, from 300 rpm to 1750 rpm. The motor is 10 hp or ... of stainless steel.Ideal for:1, For coarse grinding, medium grinding, fine polishing, crystallization, preparation, maintenance.2, Polish concrete, marble, granite, ... Area 780mm Disc Diameter 250mm*3 Disc Drive Gear drive type Water Tank 30L Noise 65DB Packing 1100*900*1300mmThe ...