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 Foredom A-M1 screw mandrels. Diameters are 25, 20 & 15 mm (.984″, .787″, .59″).To make a brush each mandrel can hold 3 –6 discs. Color and grit listed below: 25 mmDark green – 80 gritDark blue – 120 gritRed – 220 grit 20 mmDark green – 80 gritDark blue – 120 gritRed – 220 griBrown – 320 grittBlue Gray – 400 gritLavender – 600 gritLight green – 1000 gritGray – 2500 gritWhite – 5000 grit 15 mmLight green – 1000 gritGray – 2500 gritWhite – 5000 grit SKU: FOR-AK11986M UPC: 098666082010 Brand: ORO MPN: AK11986M Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.B068A