Zsteel, cadmium plated, 0.062 in. Thk, 8 ea mounting holes, 4 ea 0.312 in. Diameter equally spaced on 11.500 in. Bolt circle dia, 4 holes 0.250 in. Diameter equally spaced on 8.375 in. Bolt circle cia, o/a dim 16.562 in. Od; 7.250 in. Id; 0.875 in. H