Kryptonite Keeper 785 Chain Lock. This lock is made of 7mm four-sided 3t manganese steel chain lock, making it very strong and durable. The patent-pending end link design ensures that the chain is securely attached to the hardened deadbolt, eliminating critical vulnerability. The high security disc-style cylinder is pick and drill resistant, making the lock even more secure. The lock comes with 2 new ergonomic keys, so you always have a spare. The durable weatherproof nylon cover protects against scratches. With a length of 85cm, this lock is ideal for securing your bicycle in public places. It is easy to use and offers a high degree of security. Choose the Kryptonite Keeper 785 Chain Lock and enjoy peace of mind when you leave your bike behind.