Kryptonite Keeper series chain locks offer moderate security appropriate for quick stops in metropolitan areas or a few hours out in less populated areas. Fabric covered chains protect your bicycles paint from scratches and abrasions. 7mm four-sided chain links made from 3T Manganese steel Do not use while transporting a bike on the rack. Patent-pending end link 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 Anti-Theft Protection Offer - $500 Product dimensions: 47.3” (120cm) chain length Product weight: 3.75 lbs (1.70 kgs)