HEAVY-DUTY CHAIN: Made from 7mm manganese steel with four-sided links, this bike lock provides maximum resistance against cutting and leverage attacks PATENTED LOCKING SYSTEM: Features a high-security disc-style cylinder, resistant to picking and drilling, and a patented end link design that securely connects the chain to a hardened deadbolt, eliminating weak points PROTECTIVE FEATURES: Durable rubber coating around helps prevent scratching and wear and tear on your bike. Durable WEATHER-RESISTANT nylon sleeve prevents scratches DURABLE DESIGN: Keeper 785 Integrated Chain extends up to 85cm (33.5 in) in circumference, crafted from 7mm hardened steel links. Heavy-duty bike lock weighs 1.59kg (3.50 lbs). Includes two keys and rated 5/10 for moderate security on our scale. ATPO & KEYSAFE PROGRAM ELIGIBLE: Register to qualify for Kryptonite's Anti-Theft Protection Offer and KeySafe key replacement service LIFETIME WARRANTY AND SUPPORT: Kryptonite offers a limited lifetime warranty for peace of mind. If you experience any issues, contact our Customer Experience team, and we will resolve it quickly. We are committed to your satisfaction and product quality