1.grinding machine: 2.gear box and motor are made of aluminum: 3.automatic level adjust system: 4.best for marble,granite 1.grinding machine:2.gear box and motor are made of aluminum:3.automatic level adjust system:4.best for marble,granite Description:1.marble and granite floor grinding machinecollapsible handgrip allows easy operation , underprop system, high efficiency2. Concrete marble/ ...