Set of 4 adaptors for converting impact drive sizes. Made from chromium-vanadium steel for strength and durability, helping resist abrasion, oxidation, and corrosion. Features a black phosphate finish. Includes 1/2" F x 3/8" M, 3/8" F x 1/2" M, 3/8" F x 1/4" M, and 1/4" F x 3/8" M adaptors.