Foredom AK11986M Radial Disc Kit, 92, UnmountedForedom AK11986M Discs, with thin bristles for hard to reach areas, do not require compounds. Abrasive grains throughout the discs clean metal surfaces, remove light fire scale and oxide, finish, blend, texture, pre polish and polish precious and non precious metal, acrylics, and ceramics. Diameters are 25, 20 15 mm (. 984, . 787, . 59) with 6 discs of each listed below. Do not run handpiece in reverse! 20,000 rpm Max. Speed Includes 2 3 32 shank