A grinding aid further enhances cooler running on high-strength steel;Cubitron™ II abrasives run cooler, reducing risk of metal discoloration/oxidation and heat related stress cracks;Exceptionally long-lasting belt performs consistently and reliably throughout its life;Features 3M's tough and best in class Cubitron™ II mineral;Grains of ceramic/aluminum oxide blend are precisely-shaped, uniformly-sized and vertically oriented;Slices through hard metal for fast cut;Used with the 3M™ File Belt Sander, easily grinds out rivets and spot welds