1. Safety: Bicycle chain lock is made of manganese steel, lock core multi-layer disc lock core, cutting and strong resistance. It is the patron saint of safety.2. Design: Chain length 80 cm, the best length and thickness. The lock cylinder has a waterproof and dust-proof cover, and the anti-theft function is stronger.3. Intimate service: The bicycle lock is covered with nylon belt, which will not scratch the bicycle and motorcycle, and each chain lock has a strong and beautiful suitcase4. Application range: bicycle, motorcycle, sports equipment, garage, farm, fence, toolbox, electric vehicle, trolley, shop, glass door, and various security applications.5. Safe and portable: Bicycle chain lock with 2 keys. You can bring one key for daily use and leave the other at home in case you accidentally lose one. Double key for your convenience.