1. This aluminum alloy bicycle and mountain bike quick release is made of high-strength aluminum alloy, which is lightweight, durable and not easy to rust. 2. The quick-release design facilitates quick disassembly and installation, making it easy to carry and store, improving the portability of the bicycle. 3. The quick-release device adopts precision processing technology to ensure a stable structure, long service life and strong durability. 4. The bicycle's quick-release design conforms to ergonomic principles and is convenient and simple to operate. Even a novice can operate it easily. 5. The surface of the quick-release parts is smooth, comfortable to handle, not easy to scratch your hands, and safer to use. Specification: material: metal Specifications: 7*6*2cm Gross weight: about 25g Packaging: PP bag Package includes: Bicycle seat tube clamp quick release*1 Notes: 1. Please allow 1-2 cm error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object. The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.