3Mâ„¢ Cubitronâ„¢ II Hookitâ„¢ Cloth Disc 947A offers revolutionary performance with 3M Precision Shaped Grain on an X-weight polyester-cotton cloth backing. Our high-performing disc contains a grinding aid, making it ideal for medium to high pressure applications on stainless steel and other exotic alloys, along with carbon steel, cobalt chrome, and nickel alloys.