These abrasive sleeves feature a hard wearing back to improve longevity when working with hardwoods, softwoods and composite woods. Supplied as a pack of 6, each abrasive sleeve measures 115mm in length with diameters of 13mm, 19mm, 26mm, 38mm, 51mm and 76mm. 120 grit is our most popular grit for the bobbin sander as it is semi-aggressive yet leaves a very fine finish. ©