Milwaukee Hyperwire™ wire brush products offer faster material removal and greater life yet maintain a finer finish. The crimped wire brush is suited for general purpose surface cleaning and conditioning. Milwaukee offers crimped wire wheels in both carbon and stainless steel. The brush is designed for use on 4-1/2 or 5 in. Milwaukee and competitive grinders with 5/8 - 11 threaded spindles. Made of carbon steel.