Our Brad Waits designed quick change limit chain adjuster allows you to change your chain length by simply pulling a pin, moving to the next hole and inserting the pin. You can make a chain adjustment in seconds with no tools. The limit chain adjuster also has a Belleville spring stack to give you a cushion at the end of the chain to keep your tire on the track. This part number is our quick adjust with belleville spring. NOT IMCA LEGAL