Description: 【Materials】: Bike Chain Stabilizer is made of aluminum alloy, which is strong and lightweight. This design reduces the overall load of the bicycle and improves riding comfort and efficiency 【Wide compatibility】: Bicycle Rear Derailleur supports multiple speeds, including built in 3 speeds and external 4, 5, 6, and 7 speed to meet various riding needs 【Noise reduction design】: Tail Hook uses nylon fiber reinforced 12T guide wheel to effectively reduce the friction noise between the chain and the guide wheel, ensuring a quieter riding experience 【Smooth】: Bike Chain Tensioner is equipped with a corrugated fiber shaft to make the lateral movement of the guide wheel smoother. It is not easy to accumulate dust during long distance riding and is easy to clean and maintain 【Installation precautions】: Chain Adjuster installation requires confirmation of the shape of the hook. Only the hook can be used if it is a tail hook type. The number and type of mounting holes must meet the requirements of the purchase guide Specification: Material: Aluminum Alloy   Size Chart: 16.8cmx4.82cmx9.2cm/6.61inchx1.9inchx3.62inch Package Includes: 1 Bike Chain Stabilizer Note: Please allow slightly errors 1-2cm differences due to manual measurement.