The RockyMounts Hendrix Folding Lock provides the security of a U-lock in a compact package that will fit in the palm of your hand when folded up. This unique, folding lock features 5mm thick steel links with hardened pins for strength and security. The Hendrix seamlessly wraps around your frame and secures your ride to anything from a bike rack to a lamp post. When not in use the lock folds up compactly enough to fit in your back pocket. 5mm thick steel links with hardened pins Compact design that folds up easily Includes 3 keys