The Bell® Rampage™ 400 Chain Lock offers the strength of a u-lock with the portability of a cable lock. At 3-feet long, the chain can wrap through the frame and front wheel, securing the most vulnerable points on a bicycle. Heavy-duty 6mm diameter hardened steel links provide meaningful protection against thieves while the woven nylon sleeve prevents damage to a bicycle’s paint. The Rampage™ 400 comes with two standard keys that can be registered after purchase online, see packaging instructions on how to register. In the event registered keys are lost, Bell® will send replacements at no charge. An independent lab has rated the security of this lock a 3 on a 5 point scale. Perfect for locking bikes or other large items in low to medium crime areas.