If you hit the right side of wrestling in riding, there is the opportunity to damage the ears, which is very common, especially in long-distance riders, this accessory is best to become an essential piece.For bikes where the derailleur is held in place by the wheel nuts.Include blot and nut.Please check your bicycle transmission bracket model to find out which type fit, or we can not help this Type: Bike Rear Derailleur HangerMaterial: Aluminum AlloyQuantity: 1PcFeatures: Easy to Use, Durable, Derailleur HangerNotes:Please check your bicycle transmission bracket model to find out which type fit, or we can not help this Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Package Includes:1 x Bike Rear Derailleur Hanger