Scotch-Brite(TM) Surface Conditioning Disc TN Quick Change, 5 in x NH S SFN, 50 per case A non-woven abrasive product used for cleaning, finishing, blending and deburring applications. A metal mounting nut (5/8-11) threads on the tool with back up holder. Abrasive mineral: silicon carbide. Color: Gray MOS: 9500 RPM