5 Sizes: 13, 19, 25, 38 and 50mm. 20 sanding sleeves supplied (4 of each size), Rubber drum spindles (1 of each size). For use with power drills. Includes carry case. Ideal for sanding curves and bends 80 Grit Aluminium Oxide Shank diameter is 2.5mm on smallest These sanding sleeves are friction fit and eliminate the need for adhesives or fiddly clamps, simply push on, use and then pull off.