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 either (1) M4x12 or M4x16 Socket Head Screw - Fasteners not Included - For 12x142 and 12x148 Thru Axle - Replaces Niner Part #28-013-13-00-20