... 3,aluminum gear 4,stainless steel diamond floor grinding machine is not only grinding and polishing concrete, marble,granite, terrazzo, but ... :1,With 15 hp motor, it is good for grinding the large area;2,All gear box and motor is ... are made of stainless steel.Ideal for:1, For coarse grinding, medium grinding, fine polishing, crystallization, preparation, maintenance.2, Polish concrete, marble, ...