... ,large gear grinder 4,for concrete,terrazzo,epoxy floor grinder heavy duty is not only grinding and polishing concrete, marble,granite, ... , but also for repairing, grinding, polishing, crystallizing millstones.floor grinder heavy duty HWG 70 has the quickest motor speed, from 300 rpm ... Packing 1000*900*700mm The rotation way of floor grinder heavy duty HWG 70: The diamond tools to be chosen: The ...