The .438-1.000 MS27183 Military Flat Washer Cadmium is a high-strength washer designed to distribute the load of a fastener over a wider surface area. It is made of cadmium-plated steel, which provides excellent corrosion resistance. The washer has an outer diameter of 1.000 inches and an inner diameter of .438 inches. It is .063 inches thick. The washer is designed to be used with a bolt or screw that has a diameter of .438 inches. It is commonly used in military and industrial applications where high strength and corrosion resistance are requ