Specialty Products Company (SPC) 91040 Heavy Duty Fastrax Camber/Caster Gauge 21 inch-26 inch Add quick alignment checks to your fleet PMs. It is for your garage or shop. Portable, hands-free alignment can be done quickly and easily with the FasTrax Adjustable Camber/Caster Gauge. It includes gauge and wheel mount (fits most wheels from 21 inch to 26 inch). Along with toe arms, no lip adapters and Heavy-Duty Tape Measure. Displays Camber +/-4 degree/Caster -4 degree to +12 degree. Saves time and tires. Accurate, rugged and easy-to-use.