Description: 【Effective Chain Protection】: Our chain guide can protect the chain from falling off and prevent chain interference during great riding. It effectively prevents the chain from dropping and skipping, making it an essential tool for your bike 【Easy to Install】: Our chain guide rail is easy to install without the need to remove the crankset. You can easily adjust it using a wrench 【Quality Material】: Mountain bike chain guide rail is made of quality sturdy nylon material that's lightweight, strong. Its high strength material makes it wear resistant 【Application】: Bicycle accessories are useful tools for bicycle owners to improve their bicycles, It is simple and stylish, suitable for matching bicycles of various colors 【Note】: Applicable to threaded 1x drive system single piece chain wheel bicycles Specification: Material: Nylon Size Chart: 6.8cmx7cm/2.68inchx2.76inch Package Includes: 1 Road Bike Chain Guide  Note: Please allow slightly errors 1-2cm differences due to manual measurement.