Atoplee Green Silicone Carbon Polishing Oilstone for Ceramic Painted Metal Grinding Grit 80#/150#/240#/400#/600#/800#/1000# [All Grits, 7pcs] Material: green silicone carbide Item size: approx (150*12*6)mm Granularity:80#/150#/240#/400#/600#/800#/1000# Package Included:7pcs Green Carbon Polishing Oilstone Widely used for knifes sharpening, grinding of heat energy original workpiece, ceramic, painted metal, etc. Higher hardness, better toughness, easy to maintain, a ideal grinding tool. Material: green silicone carbide Item size: approx (150*12*6)mm Granularity:80#/150#/240#/400#/600#/800#/1000# Package Included:7pcs Green Carbon Polishing Oilstone