The L.H. Dottie HN1032 Hex Nut for Machine Screw, #10-32 TPI, is made of steel. Zinc plated finish. General use. Invincibox up to 1/2-inch. Hex machine screw nuts are for screws smaller than 1/4-inch diameter. 0.33 lb. weight. This listing is for a standard package containing 100 units.