[High Quality, Durable and Solid]-Note: Our bicycle U-locks are relatively small in size and can only lock bicycles, not large items! ! 14 mm thick carbon steel and zinc alloy lock cylinder. High safety and cut resistance, reliable quality, sturdy and durable, not easy to damage and aging, long service life, to ensure that your bike provides more secure protection. [Security and Anti-Theft] - Made of high quality hardened carbon steel with a thickness of 14 mm. Resistant to cutting, sawing, levers, excellent security and effective anti-theft. The zinc alloy lock cylinder and the complex serpentine slot copper key structure are combined, and it is not easy to open when locked, which further improves the anti-theft performance and ensures the safety of your property. &Dustproof] - The outer layer of the bicycle U-shaped lock is covered with 2mm thick PVC material, which can effectively prevent water, dust and scratches, prevent penetration rainwater and prevent the lock core from rusting. The protective layer can ensure that the lock is not worn out during use, thus extending the service life of the lock, and can also protect the bicycle from scratches. [Easy to use and carry] - One-sided release design is used to quickly open and close the U-lock of the bicycle. Easy to install, the U-shaped bicycle lock can be fixed on the seat tube of the bicycle with the attached mounting bracket, allowing you to quickly store or remove the U-shaped bicycle lock, and the use at any time without fear of losing it. [Wide Use] - This U-shaped bicycle lock is suitable for all types of bicycles and can be widely used for bicycles, motorcycles, office doors, warehouses, gates, fences and more. store doors. With our U-lock for bicycles, you benefit from maximum security. Attention: do not lose the key, otherwise the lock will not be able to open! ! Note: The data is manual measurement, please allow 1-132cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind shall prevail.