3M Scotch-Brite Roloc 2" Dia Very Fine Grade Aluminum Oxide Surface Conditioning Disc with TR plastic button has exclusive design that locks into place with a half twist. Blue disc with 25000 RPM is designed for use with right angle or straight shaft air grinders and finds application in aerospace, general industrial, marine, metalworking, MRO, transportation as well as heavy equipment while being ideal for metalworking. It features coarser, tougher abrasive, impregnated and non-woven web construction that is perfect for heavy debarring, cleaning and finishing operations. It removes grind marks, rust and coating and gives a burr-free decorative finish.