... , P120, P150, P180, P220, P240, P320, P400, P600Grain: Silicon carbide/Aluminum oxide.Package : 20pcs per poly bag ,200pcs per carton ... plaster, metal, plastic, enamel and remove rusty spots of metal materials and making grinding and polishing treatment. Open mesh screen ... abrasive grains of the screen. The grinding and cutting efficiency and durability is more efficient than the conventional abrasive ...