The Backing Pad accepts both the Cleaning Disc (31094) and the Stripping Discs (31086) The Cleaning Disc produces an 80 Grit finish and the Stripping Disc provides a 320 finish. Check your Grinder Data Tag (on tool) to determine spindle diameter. Backing Pad is standard for 5/8" x 11 Grinder Spindles. Reducer Bushings M10 x 1.25MM (43058) and M10 x 1.50MM (43059) are available for smaller 4" angle grinders such as Marita, Metabo and AEG.