Alternative Part FOR 7100035469. 3M™ Cubitron™ 3 Abrasive File Belt 33486, 80+, 3/4 in x 20.5 in (20 mm x 520 mm), 10 Belts/Carton, 5 Cartons/Case. 3M™ Cubitron™ 3 Abrasive File Belt is an advanced abrasive file belt designed for superior performance in spot weld removal and other grinding/sanding applications within the collision repair market. Available in a range of grades and sizes, this file belt can be used with various types of file belt sanding tools available in the market.