Features: Premium: The rear derailleur hanger is made of quality aluminum alloy material, and in perfect sizes. Essential: The Gear-hook is an essential part of gear-speed-changing system, it is an important part to make your bike speed changing smoothly. Even though it is a Small thing, but it does Big jobs in bike gear system. Specified Shape Size: Different bike rear frame dropout has a particular matching gear hanger. Please make sure you are picking the correct one for your bike. Including Screw: With screw, easy to install and remove Wide Use: Fits to most types of bikes, can be replaced, reduce the maintenance of frame Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Aluminium Alloy Size: 1: Length: 6m, Width: 4cm 4: Length: 15.3cm, Width: 3.7cm 7: Length: 5.7cm, Width: 4.3cm Package List: 1 Bike Rear Derailleur Hanger