Kryptonite 1016 Evolution Series 4 Integrated Chain Lock Features: 8/10 Security Rating 5.25' (63) overall length (9.70lbs) 10mm six-sided chain links made from 3t manganese steel Patent-pending end link design secures chain to hardened deadbolt eliminating critical vulnerability High security disc-style cylinder is pick and drill resistant Patented, reinforced oval crossbar lock head Sliding dustcover protects and extends cylinder life 3 stainless steel keys one LED lighted key with replaceable battery and 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.