Can be used by hand or with a cordless drill using the quick-chuck adaptor provided Six quick-change brushes fit both metric and Imperial studs: 12mm (7/16"), 13mm (1/2"), 14mm (9/16"), 16mm (5/8"), 22mm (7/8"), 28mm (1 1/8") Supplied with a 1/2"D adaptor Brushes are considered consumable and available as replacements Part Nos: 2320 12mm (7/16"), 2321 13mm (1/2"), 2322 14mm (9/16"), 2323 16mm (5/8"), 2325 22mm (7/8") and 2326 28mm (1 1/8") - Packs of 5