Electroplated Diamond Polishing Wheel Aggressive Fast Removal Sandpaper For Glass Concrete Marble Granite Flexible Polishing Pad Package:1 pieces or 4 pieces Diameter:4 inch Grit:60,120,200,400(Coarse to Fine, 1 piece each grit size) The electroplated diamond sanding pads work on marble, granite, plastic, concrete, ceramic, metal, glass, synthetic material, hard alloy, monocrystalline silicon, polycrystalline silicon etc.