Improve shifting accuracy with a new derailleur hanger with 2 fasteners. Made in the usawheels manufacturing derailleur hangers come with the required hardware to attach to the frame. Cnc machined 6061 aluminumoem 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. Black anodized finishsee below tech link for known fitments item specificationsfits brandeddy merckxfits brandpinarello.