Scotch-Brite(TM) SE Surface Conditioning Disc TN Quick Change, 7 in x NH A MED, 25 per case A coarse, tough, aggressive non-woven disc for heavy duty deburring and finishing. A metal mounting nut (5/8-11) threads on the tool with back up holder. Abrasive mineral: Medium grade aluminum oxide. Color: Maroon/Blue MOS: 7000 RPM