Product size about :As shown in the figure Product material:alloy Aluminum AlloyBike Hooks, Made of high quality aluminium alloy, Sturdy and longer use Smooth TextureGear Hanger, Good texture, smooth outward, practical Easy To UseBicycle Derailleur With screw, easy to install and remove Effective ProtectionRear Derailleur Hanger, Well protecting your bike from being damaged in case of falling down Wide Range Of ApplicationsDerailleur Hanger, Fits to most types of bikes, can be replaced, reduce the maintenance cost of frame -AFTER-SALES SUPPORT: If you have any questions or concerns about our products, please feel free to contact us. We will be happy to serve you and ensure your satisfaction. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Package Included: 1 pcs Derailleur Hanger