Ensure your bike stays secure with the KRYPTONITE Keeper 785 Chain. Ideal for the biking enthusiast who values security, this essential accessory features 7mm four-sided chain links made from sturdy 3T Manganese Steel. A patent-pending end link design connects the chain to a hardened deadbolt, eliminating a critical vulnerability often found in other bike locks. The hardened deadbolt design boosts holding power, while the high security disc-style cylinder offers pick and drill resistance. It even comes with two ergonomic "I" keys and a durable, weather-resistant nylon sleeve to prevent scratches. With the added peace of mind of the Key Safe Program, this bike lock provides robust protection against theft.