A lightweight integrated chain in the keeper line of kryptonite security products the kryptonite keeper 785 integrated chain lock is a hardened triple heat treated boron manganese steel chain made with 7 mm four sided links the keeper integrated chain secures with a new integrated lock head chain links are enclosed in a nylon webbing sleeve to protect paint from scratches the end pin link design secures the chain with the hardened deadbolt offers great holding power against attacks high sec