TEMO 10 pc Brass Rotary 1/2 inch (13mm) Cup Wire Brush Wheel #536 with 1/8 inch (3mm) shank fit Dremel and Compatible Rotary Tools New 10 pieces Brass wire cups brushes They will fit your hand drill, drill press & your Dremel and Foredom tool with a 1/8" (3.175mm) collet. Overall length is 51mm (2 inch) Shank diameter : 3.17mm (1/8 inch) suitable for removing rust and oxidation.