Super strong integrated chain and lock.
I used it only a couple of times, it is brand new.
10 mm 6-sided chain links made from 3T manganese steel
Patent-pending end link design secures chain to hardened deadbolt, eliminating a critical vulnerability
High-security disc-style cylinder is pick and drill resistant; a sliding dustcover protects and extends cylinder life
Patented reinforced oval crossbar lock head
Includes 3 stainless-steel keys: 1 LED lighted key with replaceable battery and 2 ergonomic "I" keys
Durable weather-resistant nylon sleeve over the chain prevents scratches