High Quality, Durable And Strong- Note: Our bicycle U-shaped locks are relatively small in size and can only lock bicycles, not large objects !!! The bicycle U-lock is made of heavy duty's 14mm thicken carbon steel and zinc alloy lock core. It has high security and cut resistance, reliable quality, strong, durable, not easy to damage and aging, and long service life, ensuring provide your bicycle more secure protection.Security, Anti-theft- It is made of high-quality hardened carbon steel with a thickness of 14mm. It is resistant to cutting, sawing and prying, so it has excellent safety and can effectively prevent theft. The complex structure of the zinc alloy lock core and the serpentine slot copper key are combined, and it is not easy to open when the lock is closed, which further improves the anti-theft performance and ensures the safety of your property.& Dustproof - The outer layer of the bicycle U-lock is covered by 2mm thick PVC material, can effectively waterproof, dustproof and anti-scratches, avoid rainwater penetration and prevent the lock core from rusting. The protective layer can ensure that the lock is prevented from being worn during use, so as to extend the service life of the lock, and it can also protect the bicycle from scratches.Easy To Use & Carry - It adopts unilateral unlocking design, convenient to quickly open and close the bicycle U-lock. Easy to install, the bicycle U-lock can be fixed to the bicycle seat tube using the attached mounting bracket, allows you to quickly store or remove the bicycle U-lock, easy to use at any time, and dont worry about losing it.Widely Application- This bicycle U-lock can be applied to all types of bicycles, and can be widely used in bicycles, motorcycles, office doors, warehouses, gates, fences and store doors. With our bicycle U-lock, you can get maximum security. Please note: do not lose the key, otherwise the lock will not be able to be opened !!