... 300-1600rpm; Vacuum cleaner; Diamond tool. wet stone grinding machine, stone grinding equipment Performance1, Aluminum alloy gearbox guarantee quality;2, Big ... motor: good for large area; inverter: grinding and polishing;3, Two motors to choose: 380-400V, Three P; 220- ... .Ideal for1, Smoothing rough surfaces or trowel marks;2, Grinding concrete or terrazzo;3, Repairing damaged concrete slabs;4, ...