High Quality Steel: The bicycle chain lock is made of 8mm high quality steel, 100cm long, which is not easy to damage. The chain is made of specially hardened steel, which effectively prevents shearing, cutting and theft. which greatly improves the safety of the bicycle. Waterproof fabric cover: the surface of the steel chain is covered with a waterproof and sunscreen fabric cover, cut-resistant fabric 600D, durable, can better protect the chain, extend the service life. Padlock with 2 Keys: The bicycle lock is equipped with 2 dedicated keys to prevent loss. You don't have to worry about forgetting the password or breaking the combination lock and not being able to open it. Versatile Anti-Theft Padlock: The anti-theft padlock is more secure, foldable , suitable for adult and children's bicycles, electric scooters, lawn mowers, motorcycles and even gates. Waterproof cover design: The waterproof cover is designed at the mouth of the bicycle chain lock to prevent rain and snow from entering the lock cylinder and prevent the cylinder from rusting.