The product is a set of AMMCO brake measuring tools, which includes the Brake Drum Mike Model 2400 and Safe-Mike Model 8500. These tools are used for measuring brake drums and are manufactured in the United States. They are used to determine whether or not a brake drum can be lathed and reused. Older technology that are still fully functional and calibrated. Use them, display them have a conversation about them. They are great near pristine examples of American automotive technology from years not yet forgotten. Add these wonderful pieces to your collection today