This is a custom high quality spring loaded chain tensioner. This is a must have item for Banshee's with extended swingarms. Under hard acceleration there is a tremendous amount of deflection and stretch on a chain. The tensioner has a coil spring and urethane wheel that keeps constant pressure on the chain during hard acceleration, this dramatically extends the chain and sprocket life. This is a single hole tensioner, which means it mounts to the rear hole of the stock foot peg. If you have a custom drag chassis and do not have stock foot pegs it can be mounted to the lower sub frame as long as there is some kind of mounting plate.