Keep your bike securely locked up with this KC612 Kryptonite chain lock. This bike chain lock is a performance chain model, using a covered steel lock head for great protection against possible attacks. The hardened steel chain links on this Kryptonite lock are the perfect length for multi-bike lock-ups, so it's great for families. The durable nylon webbing easily protects your bike from unsightly scratches, so it stays looking newer longer. This Kryptonite Chain Lock, Model KC612, is 4 feet long and features a security-style cylinder that is used with a dust cover to keep dirt and grime out. The protective nylon cover on this Kryptonite lock is weather-resistant, so it's made to last.