Bicycle chain adjuster, model SC-FC-108, in forged steel with a Zinc / Chrome Plated finish, used to set the rear wheel position and keep the chain at the right tension. It has a ¼” x 26TPI thread, a length of 50-55 MM and a 10 MM diameter, and comes as an adjuster with open caps. A flat strap with a round eye at one end leads to the threaded shank, which carries a bent tab plate and a hex nut.