Description: 【Effective Chain Protection】: This mountain bike 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 bicycle 【Bicycle Essential Tool】: Designed for integrated flywheels, this road bike chain guide ensures more stable operation. It is suitable for diameters of 3.2 cm-3.5 cm/1.26 inch-1.38 inch. As a useful tool for bike owners to improve their bikes, this accessory is a must have 【Easy to Install】: Our bicycle chain protector is easy to install with no need to remove the crankset that just need to simply adjust with a wrench 【Quality Material】: Made of quality sturdy aluminum and plastic materials, this mountain bike chain guide is lightweight, strong. Its high strength material resists wear and deformation 【Product Dimensions】: The bicycle chain stabilizer is in size 6.8 cmx7 cm/2.68 inchx2.76 inch, great for repairing, maintenance replacement accessory Specification: Material: Aluminum Plastic Size Chart: 6.8 cmx7 cm/2.68 inchx2.76 inch Package Includes: 1 Road Bike Chain Guide  Note: Please allow slightly errors 1-2cm differences due to manual measurement.