This listing is for 200 valve locks from Elgin Industries that are made in the USA. They are 7° stamped steel locks that fit single groove valves with 11/32" diameter stems used in many passenger car and truck 4, 6, and 8 cylinder engines and are compatible replacements for GM, Buick, Cadillac, Chevy Chevrolet, Ford, GMC, Lincoln, Mercury, Oldsmobile, and Pontiac engines.