Features: 7mm four-sided chain links made from 3T Manganese steel Patent-pending End Link Design secures chain to hardened deadbolt eliminating critical vulnerability Hardened deadbolt design provides extra holding power High security disc-style cylinder is pick and drill resistant Includes 2 new ergonomic "I" keys Durable weather-resistant nylon sleeve prevents scratches Key Safe Program Product dimensions: 33.5 chain length Product weight: 3.50 lbs.