3M Cloth Belt 302D, P320 J-weight, 2 in x 132 in, Film-lok, Full-flex, 25 per inner, 50 per case3M Cloth Belt 302D is an aluminum oxide belt with open coat construction and a flexible J-weight backing that conforms well for sanding contours and complex parts. It is best-suited for light grinding, finishing, deburring and setting the grain on carbon steel and stainless steel, as well as soft metals like aluminum, brass, bronze and copper.