Hardened triple heat-treated boron manganese steel chain made with 7 mm four-sided links. Chain links are enclosed in a nylon-webbing sleeve to protect paint from scratches. End pin-link design secures the chain with the hardened deadbolt. High security disc-style cylinder is pick and drill resistant. Comes with 2 ergonomic 'I' keys which make opening a disc-style cylinder much smoother. 85cm Chain Length. 1.59kg.