Description: Name: Rear Derailleur Hanger Material: aluminum alloy Accessories: All tail hooks are equipped with screws! Color: The tail hook is mainly silver, some styles are black, colorful, random delivery, please make sure that the tail hook used by your bicycle is consistent with our options before purchasing Packing list: 1 x Rear Derailleur Hanger Note: Different displays may cause the color of the item in the picture a little different from the real thing. Manual measuring,please allow 1~3mm error,thank you. --Upgrade or replacement rear derailleur dropouts; stiffer and more rigid to improve shifting performance --CNC machined from solid 6061 aluminum to exact tolerances --Stiffer than any equipment hanger which improves shifting performance --Still breaks before your frame does to perform its main function --All hangers come with instructions and hardware, Direct replacement for equipment with guaranteed fit