Kryptonite KryptoLok Series 2 Integrated Chain Lock Features: Available in multiple chain sizes 9mm 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 additional protection High security disc-style cylinder is pick and drill resistant Patent pending integrated lock head with talon deadbolt Includes 2 new ergonomic I keys Durable weather-resistant nylon sleeve prevents scratches Key Safe Program Note: Due to manufacturer restrictions, Kryptonite products can only be shipped to addresses within the United States. Note: On eligible locks, customers can opt into Kryptonite's Anti-Theft Protection Offer (Atpo). Purchase a 1-year or 2-year plan for up to 5,000 dollars in theft coverage. Atpo is only available on locks with a Security Rating of 5/10 or greater. See full details, verify eligibility and get registered here.