Improve shifting accuracy with a new Derailleur Hanger with 1 Fastener. Features-Wheels Manufacturing Derailleur hangers come with the required hardware to attach to the frame.-Made in the USA-CNC machined 6061 aluminum-OEM hangers are only produced by a handful of manufacturers, mostly in Taiwan and China. As a result, you will see many bikes with exactly the same hanger. Bicycle manufacturers may make mid year changes.