Convenient Useful Rear Derailleur Hanger Frame Extender Hook Tail Accessories Adapter Aluminum Alloy Bicycle Bike 1PC Convenient Useful Rear Derailleur Hanger Frame Extender Hook Silvery Sports Tail Accessories Adapter for Bike Details: * new and high quality *Used on bikes where the derailleur is held in place by the wheel nuts. *The rear hook is made of aluminum alloy, allowing a certain deformation to protect the transmission from damage. *Color: Silver(As Pictures Show) *Material:Aluminum alloy *Dimension:6.2*4cm/2.44*1.57inch(Approx.) Warm tips: *The rear derailleur is attached to the end of the hook when we must right now. We must distinguish between positive and negative. *If your tail hook fracture often change, please check your rear derailleur gear system and whether there is a problem. Package Contents: 1*Bike Rear Derailleur Hanger Note:The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.