Material: Carbon steel Size: one size Color: as shown 1. Universal compatibility: Suitable for single-speed bicycles, including children's bicycles, easily adaptable to various models, meeting the installation needs of different users. 2. Quick disassembly and assembly: The magic buckle design can complete the connection and separation of the chain without tools, which is simple to operate and saves time and energy. 3. One lasting material: Made of high-strength material, it ensures that the chain buckle maintains stability and wear resistance in long-term use and extends its service life. 4. Precise bite: The unique lock structure ensures a firm connection, avoids loosening during riding, and improves safety and riding experience. 5. Lightweight and compact: The product is small in size and light in weight, easy to carry and store, and is an ideal accessory for DIY repairs and daily maintenance. Package includes:1pcs Bicycle chain buckle