Kryptonite&';s KryptoLok Series 2 995 Integrated Chain is a 9mm-thick, four-sided link chain made of triple-heat-treated manganese steel for serious strength. Its integrated high-security lock cylinder is pick, drill, and cut resistant. This 37.5-inch chain is covered with a weather-resistant nylon sleeve that protects your bike&';s finish. Plus, the KryptoLok Series 2 has an anti-theft protection offer. SPECIFICATIONS & FEATURES 9mm four-sided chain links made from 3T MANGANESE STEEL Patent-pending END LINK DESIGN secures chain to hardened deadbolt eliminating critical vulnerability Hardened DEADBOTL DESIGN provides additional protection HIGH SECURITY DISC-STYLE CYLINDER is pick and drill resistant Patent pending integrated lock head with "TALON" DEADBOLT Includes 2 ERGONOMIC "I" KEYS Durable WEATHER-RESISTANT nylon sleeve prevents scratches Key Safe Program Product dimensions: 37.5" (95cm) chain length Product weight: 5.55 lbs (2.52 kgs)