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 an 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. Excellent anti-mite/rust/waterproof properties. The keys are also made of copper, making them difficult to duplicate, wear-resistant, durable, and can be unlocked smoothly forever. High strength, good precision, rust-free, luxurious and durable product, so you can use it safely and conveniently. 【Dust-proof Shutter Design】Dust and sand getting stuck in the shutter part and making it difficult to open is a common phenomenon, so an easy-to-use and clog-resistant dust-proof shutter has been designed!! 【Easy to Open and Close】The key can be used on both sides, regardless of the front or back. When locking, just insert the tip into the keyhole!! To unlock, insert the key, turn it around, and just 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!