1. Security Design: With a diameter of 0.18 inches lock body helmet lock has high strength and high tenacity for strong anti - cutting . The whole-body PVC coating can effectively prevent scratches. 2. High Scalability & Reinforced Steel Cable: The lock chain is highly stretchable and can be stretched up to 60 inches, you can use it ly. The reinforced steel cable provides excellent anti-cutting and anti-theft performance for this lock. 3. Perfect Dailly Tool: This little cable lock can be used to lock helmets, bicycle wheels, strollers, luggages, doors, ladders and any other things you want. 4. :The little helmet lock has a 4 digit code, very easy to set your desired code by turning the lock collar as the user manual, quick to secure and remove, easy to customize combination. (Tips: Take a photo to avoid forgetting the password. If you receive the lock that cannot be opened or cannot be opened after changing your password, please email us to help solve it.)