End link design secures chain to hardened deadbolt offering no weak links in the chain. Features: Features the integrated Evolution series 4 lock head and 10mm, 6-sided chain links made of 3t manganese steel Includes three stainless steel keys - two standard "I" keys and one LED lighted key Weather-resistant nylon sleeve prevents scratches to painted finishes High security disc-style cylinder is pick and drill resistant; resists most common hand tools Key Safe Program Security Rating: 8 out of 10 Specifications: Weight: 6.1lbs