1. **STURDY LOCK CYLINDER**: The locking head is crafted from temperature resistant ABS eco friendly material. The zinc alloy lock cylinder features an international standard locking plug system, offering dustproof, waterproof, drill resistant, and saw resistant protection. 2. **EASY TO USE AND PORTABLE**: The cups glide smoothly and precisely. The clear, printed number combinations are large and visible even in low light conditions. When not in use, it can be conveniently wrapped around the frame or handlebars. 3. **FAREWELL TO THE KEYS**: The advanced 5 digit combination provides over 100,000 possible combinations, significantly reducing the risk of being cracked. 4. **STRONG HARDENED STEEL CHAIN**: This robust, performance chain is drill proof, saw proof, and virtually indestructible. The total length of the bicycle chain lock is 90 cm. Additionally, you can connect multiple chains together for extended security.