U4/Bike Lock Chain Lock Bike Bicycle Diameter 22mm 【Extra Thick & Extra Thick】Diameter 22mm Extra Thick Wire 10mm x PVC Coat 12mm x Nylon Cover protects your precious car from criminals. We have adopted even thicker ultra-thick wire in pursuit of security. The main purpose is for customers to use the product with more peace of mind. 【Copper Cylinder & Key】Equipped with a copper key cylinder that automatically springs back. It also has excellent anti-mite/rust/waterproof properties. In addition, the key is also made of copper, making it difficult to duplicate, wear-resistant, durable, and can be unlocked smoothly forever. This is a safe and convenient product because it is high-strength, good precision, rust-free, luxurious and durable. 【Dust-proof Shutter Design】A dust-proof shutter is designed to be easy to use and less likely to clog, as it is common for dust and sand to get stuck in the shutter and make it difficult to open! 【Easy to Open and Close】The key can be used on both sides, regardless of the front or back. When locking, simply insert the tip into the keyhole! When unlocking, simply insert the key, turn it around, and pull out the tip! The operation is simple and not troublesome. The length is 1200mm and is applicable to a wide range of vehicles such as motorcycles, scooters, bicycles, and office doors!