All New for 09-10 Windtunnel now has the most durable hinge pin available for your front end. Fits Windtunnel, Associated & other front ends. Threaded with 2-56 on one end, slotted on the other for easy use. This pin eliminates the need for shims that are easy to lose. DO NOT over tighten. Doing so will bind your upper arm. Comes in pairs