Description: Sturdy: The bike rear derailleur extender is made of quality aluminum alloy, which is rustproof, wearable, not easy to break or deform. Easy installation: The bike tail hook is easy to install with screws, not taking much effort, not taking much labor. Precision: The bicycle part features fine workmanship, easily fitting your bikes without modification, making it a good replacement. Compact: The mountain bike tail hook is very small and lightweight, easy to carry and store, not taking much space. Colored: The bicycle part features colored designs, easy to match various bike frame decorations, making your bikes unique. Specification: Material: Aluminum Alloy. Size: Approx. 4.5x2.2x1.2cm/1.77x0.86x0.47 inch. Color: Show as pictures. Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Bicycle Rear Derailleur Extender.