Diablo's grinder to sander conversion kit easily converts any angle grinder into a sander. Use this kit when switching from a grinding wheel to a fiber disc. All components necessary to begin polishing are included in this kit: back-up pad, locknuts and fiber discs. Conversion kit includes - (1) back-up pad, (1) 5/8-11 locknut, (2) 50-Grit (Coarse) fiber discs Diameter - 7" Arbor - 5/8" Fits all 7" grinders with 5/8"-11 spindles