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 and can curl round bosses and obstructions. Much tougher than wire brushes, probaly outlasting them ten times. Use the fine abrasive nylon brushes for non-ferrous material and the coarse abrasive nylon brushes for ferrous. They remain free cutting to the end. 2 sizes are available: coarse (25mm) and fine (25mm).