3M™ Cloth Belt 577F, 36 YF-weight, 1 in x 18 in, Fabri-lok, Single-flex. When traditional aluminum oxide belts aren’t cutting it, try 3M™ Cloth Belt 577F with alumina zirconia abrasive grain. It offers increased cutting efficiency compared to aluminum oxide, and has a heavy, water-resistant polyester backing that stands up to high-pressure applications and edge work.