Fast and easy way to measure toe-in - slide the pointers against the tires, then measure toe to within 1/16", Loosen the thumb screws to adjust the width of the pointers for maximum accuracy, Easily done by one person - place the gauge in front of the tires and align the pointers within the scribe lines, Built to last, this toe-in gauge is constructed of strong billet aluminum, Features easy-to-read measurements and is adjustable up to 70" in width.