3M™ Cloth Belt 340D, 60 X-weight, 6 in x 186 in, Film-lok, Single-flex. 3M™ Cloth Belt 340D is an open coat premium grade aluminum oxide cloth belt that provides durability for aggressive stock removal, resists loading, and is suitable for a variety of applications on wood and metal. This belt is recommended for wide belt sanding, edge sanding, or portable belt sanding.