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 special M4x14 Torx Flat Head Screw - Fastener not Included - For use with 142x12 or wider Thru Axle Hubs - Replaces Scott Part #219574 and 219577 Note: this hanger is for use with 142x12, 148x12, or 197x12 rear hubs.