... machine vacuums 1,big power 2,Low cost high quality 3,Gear grinder polisher 4,for concrete,terrazzo,epoxy concrete polishing machine ... is made of Aluminum alloy,which is strong and durable;3,NSK bearing. It has automatically raising and lowering system;4 ... , granite, terrazzo with various grit of diamond metal, resin bond.3, Remove painting, coating, epoxy, urethane, glue, polyurethane, mastic with PCD ...