... grinding stones 1,for concrete,terrazzo,epoxy 2,siemens motor,220V,380V 3,aluminum gear 4,stainless steel angle grinder grinding stones HWG ... 100% touch wall and grind corner.Advanced angle grinder grinding stones HWG 59 would not leave trace on floor. The old ... :1, Pre-treat and level the concrete surface before epoxy coating;2, Grinding and polishing concrete, marble, granite, terrazzo;3, for coarse ...