Step up your bike protection wgame ith the Kryptonite KryptoLok Series 2 915 Integrated Chain Lock. As tough as it looks, this lock's chain links are made of hardened Manganese steel for maximum strength against attacks, while the water-resistant, protective nylon cover with hook-and-loop fasteners keep the chains underwraps for protection against scratches to your frame and deflects rain. The hardened deadbolt locking system enhances the lock's overall holding power, which is secured by the patent-pending End-Link design to eliminate critically vulnerable spots. Drills and picks are useless against the reinforced, high-security disc-style cylinder.