The AMMCO 8500 Brake Drum Micrometer Gauge Safe-Mike Vintage Tool is a precision measuring tool used for checking the thickness of brake drums on vehicles. Made in the United States by AMMCO, this micrometer gauge is a set consisting of a single piece. With a manufacturer part number of 8500, this vintage tool provides accurate measurements for ensuring proper brake performance. Perfect for automotive enthusiasts and professionals alike, this product is a reliable and high-quality tool for maintaining vehicle safety.