Scotch® Scotch-Brite SE Surface Conditioning Discs, 4 1/2", 13000 RPM, Alum Oxide, Brown (405-048011-18079) 50 EA / CTNA coarse, tough, aggressive non woven disc Contains a backing that mounts to hook and loop pads Diameter = 4 1 2 in Speed = 13000 rpm [Max] Color Code = Brown Roughness Grade = Coarse Shank Abrasive Material = Aluminum Oxide Mounting = Hook & Loop Applications = Deburring, Finishing Type = Disc