1. The design of this bicycle hub axle takes into account both rigidity and comfort. It is very durable and rolls smoothly. 2. The front and rear bicycle axles can be used to remove the rear wheel of the bicycle for cleaning, transportation, and maintenance. They can also keep the chain in place. 3. The mountain bike wheel axle can prevent the chain from tangling during transportation or when cleaning the chain and prevent the frame from being scratched. 4. The hub axle is easy to use. Simply remove the rear wheel from the bicycle and clip the chain holder or dummy hub onto the hook. 5. The bicycle hub axle allows the bicycle to move with the wheels removed and can also move the derailleur. 6. This bicycle wheel axle is made of metal, which is strong and durable with a long service life. It is easy to install and remove, making it convenient to use. After precision machining, it has high strength and is not easy to break. It can continuously perform well and enhance your cycling performance and experience. It is suitable for most bicycles with matching lengths. 7. Features: - Bicycle hub axle - Color: Black - Material: Metal - Size: The rear axle is 18 cm (7.09 inches). - It can keep the chain tight and away from the frame and paint. 8. Package contents: 1 bicycle rear hub axle