DROPOUT 309, SCOTT - CNC machined 6061 aluminum. - Black anodized finish. - Attaches to frame with special M5x14 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. - 1 drop out per bag.