TruBuilt 1 Automotive Conditioning Disc SC-DB, Coarse 3", Type R | Package of 25 3 inch Grinding Disks | Compare to 3M 07485 ROLOC 3" Coarse Surface Conditioning Discs Name Brand Quality (compare to 3M 07485) - At up to 50% LESS! Compare price and quality to 3 M coarse conditioning disc product. Try them and if you don't like them or can tell the difference between these and the 3M discs, return them for a full refund. Industry leading, long lasting disc life, just like the name brand products. 3" size efficiently removes rust, gunk, gasket material, paint, scale, etc. Convenient box of 25 disks and has a maximum operating speed of 20,000 RPM.