Stud Cleaning Tool Kit is a handy kit consisting of both SBCT22 (Commercial Truck and Bus Stud Cleaning Tool) and SBCT13 (Automotive, Light Truck, SUV, Utility Trailer Stud Cleaning Tool) as well as every replacement brush size for the corresponding tools. This handy shop wheel maintenance and safety kit contains SBCT22, SBCT13, 2 x 1/2″ Drives, Replacement brush sizes 12mm, 2 x 13mm (one pre-loaded in tool), 14mm, 16mm, 18mm, 20mm, 2 x 22mm (one pre-loaded in tool) and Safety Glasses. Counteract’s Stud Brush is designed to quickly and effectively clean rust, and corrosion from the surface of wheel studs, it has the ability to effectively clean 10 studs in under 3 minutes. The brush inserts are held in place by 3 allen screws for a quick and easy change. Each brush is capable of cleaning well over 100 wheel studs, depending on their condition. Each tool comes with a detachable 1/2″ drive for use with Counteracts Low Speed Air Driver (sold separately or in a kit), or your battery powered drill. We do not recommend the use of an impact gun as the tool does not require that force. Simply allow the brush to do the work. Forward onto the stud, Reverse off. More information at: http://www.counteractbalancing.com/products/stud-brush/