1. PACKAGE CONTENT: A secure and practical bicycle cable combination lock with two keys and a mounting device for attaching to the bike. Locking is extremely convenient and can be done directly without a key. 2. PORTABLE AND PRACTICAL: The bicycle lock's mounting bracket can be installed under the saddle, connecting the autoretracting spiral combination lock to the holder on the bike. This not only enhances the appearance but also effectively prevents collisions and wear caused by the lock. 3. LIGHTWEIGHT AND DURABLE: Made of a lightweight yet sturdy cable, this bike lock has a total length of 19.68 inches (500 mm) and a thickness of 0.39 inches (10 mm), providing sufficient length and thickness to ensure bike safety. 4. WATERPROOF MATERIAL: The lock's chain is coated with PVC, making it scratchresistant and waterproof. The lock head is crafted from quality plastic, ensuring it won't rust even during long rides in the rain.