Kryptonite 001706 Keeper 712 Integrated Chain - 48in.

7mm four-sided chain links made of 3t manganese steel.
End pin-link design secures the chain with the hardened deadbolt.
High security disc-style cylinder is pick- and drill-resistant and resists most common hand toold.
Hardened deadbolt provides extra holding power when subjected to leverage attacks.
Durable weather resistant nylon sleeve prevents scratches to painted finishes and protects the chain against the elements.