DROPOUT 200, TREK/GARY FISHER - Trek, Gary Fisher. - CNC machined 6061 aluminum. - Black anodized finish. - For M12x1.25 Thru Axle. - Replaces: Trek/Gary Fisher part # W294666 or W307718. ~ Notes: 1) Post on this hanger is 16.5mm (.650") in length with an M12 x 1.25 thread. Please check your hanger before ordering to make sure this is a match. 2) Trek recommends that you apply a removable thread-locker such as LOCTITE 243 to the threads during re-assembly. Failure to do so may result in fasteners loosening during use. - 1 drop out per bag.