(SAE: 6-32, 8-32, 10-32, 10-24, 1/4-20, 5/16-18, 3/8-16, 1/2-13), 281pcs nuts, and a blow molding storage box. Sturdy and Durable : This 16″ rivet nut tool is made from thick carbon steel with heat treated, and black phosphating finishing protects against corrosion.