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 your bike or scooter. Heavy duty 6mm diameter hardened steel links provide meaningful protection against thieves while the woven nylon sleeve prevents damage to a bicycle's paint. An independent lab has rated the security of this lock a 3 on a 5-point scale.