Superb for putting a soft virtually grain free sheen on abraded or machined surfaces, doing fine deburring of intricate items, removing fine rust or material out of rust pits. The bristles are more flexible than those of wire brushes & can curl round bosses & obstructions. Much tougher than wire brushes, probaly outlasting them ten times. Use the fine abrasive nylon brushes for non-ferrous material & the coarse abrasive nylon brushes for ferrous. They remain free cutting to the end. 2 sizes are available: coarse (25mm) & fine (25mm).