3PC 8 Inch polishing wheels for benchgrinder: Used on 8 Inch bench grinder for polishing of stainless steel, steel, iron, aluminum alloy, brass etc. Sizes and details of the 8 Inch polishing wheels: All buffing wheels with 5/8 Inch arbor hole and 1/2 Inch thickness. 1PC 8 Inch sisal buffing wheel, made of fine sisal cloth and cotton cloth, spiral sewn, coarse for first stage polishing. 1PC 8 Inch denim buffing pad, made of denim cloth, concentric sewn, for middle stage polishing. 1PC 8 Inch cotton buffing wheel, made of fine cotton cloth, concentric sewn, soft for final stage polishing. 3 steps for metal polishing: Step 1: Use sisal buffing wheel with black polishing compound to polish stainless steel, steel and iron. Use sisal buffing wheel with brown polishing compound to polish aluminum alloy and brass. Step 2: Use denim buffing pad with green polishing compound to polish stainless steel, steel and iron. Use sisal buffing wheel with blue polishing compound to do the final high polishing on aluminum alloy and brass. Step 3: Use cotton buffing wheel with white polishing compound to do the final high polishing on stainless steel, steel and iron.