4-digit combination: 4-digit combination U lock, high-quality anti-theft lock cylinder, to prevent thieves from using a universal key to break your lock. The keyless use saves the trouble of losing the key and has higher security. Without bracket [Solid lock] U locks are heat treated to increase hardness and strength, and are not easy to break, cut and violence. Dust cover: The locking mechanism adopts a flip design, which can not only prevent dust and sand, but also prevent rainwater from directly soaking the locking mechanism, extending the service life of the U-shaped lock. Pvc coating: The metal solid lock is PVC coated, and the engineering plastic is a soft shell, which will not crack at low temperatures or deform at high temperatures. Dimensions: 16 mm (thickness), 9 inches (length) x 5.7 inches (width) U-shaped bicycle lock-Please note: manual measurement is for reference only. The heavy-duty bicycle U-shaped lock makes your riding journey more enjoyable and relaxing. Combination lock with 4 digits code, plus thousands of code combinations, plus sturdy lock beam, the thief will not disconnect the lock in a short time. Size: 16mm (thickness), 9" (length) x 5.7" (width)