This great too is a must for your garage and can t be beat at the track. Portable hands-free alignment can be done quickly and easily with the FasTrax Adjustable Camber/Caster Gauge. This tool will help you fine tune your alignment for optimal trackingand handling while minimizing alignment headaches. Includes gauge and wheel mount (fits most wheels from 13 to 17 ). Displays Camber +/-4° and Caster -4° to +12°. Saves time and tires. Optional Toe Adapter kit #91100 sold seperatly. Installation Instructions