The Clamp-On Single-Sided Chain Keeper is designed to maintain your chain on a Return or Power Idler. The single-sided and double-sided Clamp-On Chain Keepers are T-Cycle exclusive products. Nowhere else will you find a chain keeper that clamps onto the head of an idler bolt. Clamping on means freedom to easily float your idler, now that the chainkeeper attaches itself independently of the idler. It also means super easy setup and maintenance- you can pop the chainkeeper off and back on anytime. The abrasion resistant nylon arm, stainless steel fasteners and high quality machined aluminum means your Clamp-On Single-Sided Chain Keeper will be with you a long time.