All Wheels Manufacturing replacement derailleur hangers are produced in our Colorado shop to exacting tolerances. CNC machined 6061 aluminum Black anodized finish Attaches to frame with (1) M4X 19mm SHOULDER BOLT (M4-19SH) Included COOP USED WITH Dropout-4

Wheels Manufacturing Derailleur Hanger - 433-03. Wheels Manufacturing hangers are stiffer than almost any OEM hanger which improves durability and shifting performance.OEM hangers are only produced by a handful of manufacturers mostly in Taiwan and China.