The Mercer 188030 4-inch Crimped Wire Cup Brush is constructed for even balance. The Mercer 188030 is made of .014 carbon steel and has a 5/8-inch- 11 fixture to fit most 4-inch angle grinders. Features: * Utilizes an internal holding plate to secure brush bristles * Made of carbon steel * 5/8-11 thread What"s In The Box: * Mercer 188030 4-inch Crimped Wire Cup Brush