All Wheels Manufacturing replacement derailleur hangers are produced in their Colorado shop to exacting tolerances. – CNC machined 6061 aluminum – Black anodized finish – Includes (3) M4x10 Flat Head Screws Note: Wheels Mfg DROPOUT-145 is interchangeable with Wheels Mfg DROPOUT-218. #145 has three fasteners, where #218 has two.