Feature:1. High Quality Material: The bike rear derailleur extenderis made of quality aluminum alloy with CNC machining, sturdy and firm, durable and corrosion resistant.2. Stable Performance: The bike rear derailleur hanger makes the flywheel speed change more smoothly. It also makes your riding smoother and provides a good riding experience.3. Application: The bike rear derailleur extension is used to lengthen the rear dial chain, and apply to mountain or road bike modification with 34-52T large flywheel.4. Lightweight: This frame gear tail hook extender only weighs 22g / 0.78oz, it is very light and portable. You can take it with you at any time, and you can directly replace it when it is convenient.5. Great Accessory: The bike alloy rear derailleur hanger is a great accessory for cycling enthusiasts. Bright colors to give your mountain bike more personality.Specification:Item Type: Bike Rear Derailleur ExtenderMaterial: Aluminum AlloyGross Weight: 22g / 0.78ozApplication: Suitable for mountain or road bike modification with 34-52T large flywheel.Package List:1 x Bike Frame Tail Hook Extender1 x Screw