Counteract's Automotive Wheel Cleaning Kit is designed to quickly and effectively clean rust, and corrosion from the surface of wheel studs and wheel hubs. The stud cleaning tool has the ability to clean over 10 studs in under 3minutes. The 13mm tool is designed for use on commercial truck and bus applications that use a standard 13mm wheel stud. The kit comes with two 13mm brush insert, but is also compatible with replacement brush sizes 12mm, 14mm, and 16mm. The brush inserts are held in place by 3 adjustable set screws. Each brush is capable of cleaning well over 100 wheel studs, depending on their condition. Each tool comes with a detachable 1/2" drive adapter for use with Counteract's Low Speed Air Driver. We do not recommend the use of impact guns and the Stud Tool does not require that force. Simply allow the brush to do the work. Forward onto stud, reverse off. More information at; http://counteractbalancing.com/products/stud-brush/