COMBINATION BIKE LOCK: 4-digit resettable combination lock mechanism is easy and fast to operate, with about 10,000 code combinations, not easy to crack and never worry about lost the key or forget it. Unique 360¡ãrotating lock design is convenient to see and lock and unlock. Initial password 0000 .HEAVY DUTY ANTI-THEFT: This bike lock is made of zinc alloy lock cylinder and alloy steel lock body, 6 thickened steel chains ensures that the bike security is indestructible. Keep the casual thief from a grab and run..MULTI-PURPOSE USE: The folding bike lock is 33.5inch long, can be lock road bike, mountain bike, motorcycle, folding bike, scooter or other bicycles. The ABS-wrapped lock is smooth to the touch and won't scratch the bike paint..COMPACT FOLDING LOCK: The lock is foldable for storage, saving more space in the frame, and comes with a storage bracket that allows the lock to be attached to the bike with screws or two hook-and-loop straps..Any using question or problem please let us know, we will help you to figure out and solve it.