Heavy duty bicycle U lock is made of hardened max-performance steel shackle resists cutting and leverage attacks.
Lock features a zinc alloy lock core and a sophisticated keyway that is very effective against a variety of keyless unlocks.
Removable, sealed unit alarm module water, vibration, frost and heat-proof
Anti-scratch and Waterproof: Silica gel layer coated protect the lock and your bicycle prevent scratched? and it also waterproof, no worry getting rusty.
Tough hardened steel disc lock