20pcs Dia 25mm Rotary Steel Wheel Wire Brush Set - Fits Dremel ,1/8" Shank ,Clean, Polish, Prep New 20 pieces STEEL wire FLAT BRUSHES They will fit your hand drill, drill press & your Dremel and Foredom tool with a 1/8" collet. Overall length is 43mm (1 3/4 inch); Shank diameter : 3.17mm (1/8 inch) Wheel diameter : 25mm (3/4 inch); Wheel thickness : 1mm to 1.5mm Suitable for removing rust and oxidation.