Diablo, 50 pack, 5'', 320 grit, hook & loop, sanding disc, premium 12 hole random orbital sanding discs with hook & lock backing include break through innovations that improve performance, extend sanding life & increase productivity, featuring premium ceramic blend, remove material faster than other sanding discs & offer an extra long sanding life, clog shield, blend of grinding agents, reduces loading & maximizing productivity, superior grain bonding system, endura-bond, longer life & extreme durability.