Kyrptonite's Keeper 585 Integrated Chain is a real tough, chunky chain that utilises 5mm thick four sided chain links built from hardened carbon steel with a durable weater-resistant nylon sleeve that stops scratches. It features a hardened locking pin that provides additional holding power, wafer style cylinder that adds resistance from picking and drilling and comes with two ergonomic keys. The Kryptonite Keeper 585 Integrated Chain weighs in at 730g (1.61lbs).