Features: 1. For temporary use or repair bike chain when you have a broken chain on the trip. Make the chain cleaning and maintenance easier. 2. Constructed of quality and high-strength materials. Durable and not easy to rust. Easy to install and use. 3. High compatibility, suitable for various brands of transmission systems, 6-7-8S/9S/10S/11S/12S complete specifications. 4. Please note that the speed of the buckle must be the same as the speed of the chain. It is recommended to disassemble and assemble no more than 5 times. 5. It is recommended to use special quick-release pliers for installation. Suitable for most road bike, mountain bikes, track bike, etc. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: carbon steel Color/Style: As the picture shown Speed: 6-7-8 speed/9 speed/10 speed/11 speed/12 speed Package List: 6 pairs of Bike Chain Buckle