High-strength alloy steel chain The inner chain is made of 6mm high-quality alloy steel and cannot be cut or opened by thieves. Durable and secure to resist cuts and a protective coating to prevent scratches. Strong 5-Digit Password CombinationProvides 100,000 password combinations, 10 times harder to crack than a 4-bit password, which is almost impossible to crack. Save yourself the trouble of the key, just enter the password to unlock, very convenient. Easy CombinationThe default code is 00000. Turn the plastic knob 90 degrees clockwise. clockwise to the indicated position, then set a new code (it is recommended to set 00001 first to ensure that the numbers are aligned with the pointer). Then return the knob to its original position. The new password will be set successfully. Suitable for bicycles and motorcyclesWith a length of 90 cm, you can attach the wheel to poles, trees, railings and other accessories. It can also be used to close doors, garden fences, sports equipment, gates, stairs, anything that needs to be closed. Fabric cover for protection A special cover Made of waterproof, dustproof and anti-friction fabric for the outside of the chain, which plays a good role in protecting the chain and making the lock more durable. The cover also keeps your hands away from the metal chain, making it easier to use. If you have any issues, questions or concerns. Please contact us!