specification Type: chain tensioner Material: 6061 aluminum alloy Application: folding bike at a speed Features: stable chain, exquisite workmanship, light weight, easy installation, high-quality materials, durable, bicycle accessories Size: approx. 5.5 x 9.3 cm / 2.17 x 3.66 inch Characteristic Exquisite craftsmanship, high-precision CNC machining, anode color, bearing shaft, can be used with various guide wheels, the guide wheel generally has 11 teeth, 13 teeth can also be used. The floating pulley and spring can be adjusted for the best chain tension. Lightweight and easy to install, made of high quality aluminum alloy, durable. The derailleur guide wheel is light, small and easy to install and use. Package include: 1*chain tensioner Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don""""""""t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it Have a great time shopping!