These uprights are for the TT-02 chassis that allows you to alter the toe of your machine, a vital set-up feature that governs steering response. Attaching these uprights in place of the kit standard resin parts (A11) alters the toe angle from 0 degree at kit standard to 2.5 degrees. Aluminum parts provide greater precision and strength, allowing you to keep the rear of the car under close control through corners. Parts are anodized in Tamiya blue and marked with angle (2.5) and A or B to aid in identification.