You are buying ten (10) NOS Auveco fasteners. They are 5/16-24 (fine thread) black phosphate spring steel low carbon cage nuts that can be used various models & years of Ford, Edsel, Mercury, Lincoln & Willys vehicles. These nuts have a .028" - .056" panel range. They fit into a .460" - .465" or .503" - .508" square mounting hole.