3M Scotch-Brite Roloc Surface Conditioning Disc. SC-DR, A/O Very Fine, TR, 4". Tough non-wovern dis aggressively deburrs and finishes. Conformable, non-woven disc combined with Roloc backing allows for aggressive cutting. Open-web construction resists loading and runs cool, allowing for consisent finishes. The convenient 3M Roloc attachment system offers quick and easy disc change-out for multi-step finishing processes.