concrete polishing machine vacuums 1,big power 2,Low cost high quality 3,Gear grinder polisher 4,for concrete,terrazzo,epoxy concrete polishing machine vacuums is not only grinding and polishing concrete, marble,granite, terrazzo, but also for repairing, grinding, polishing, crystallizing millstones.concrete polishing machine vacuums HWG 70 has the quickest motor speed, from 300 rpm to 2000 rpm. ...