Features: Chrome Vanadium Steel sockets with hardened S2 bits for enhanced durability Phosphate finish for corrosion resistance Specification: Drive: 1/4", 3/8" and 1/2" 1/4" Drive: H2, H2.5, H3, H4, H5, H5.5 and H6 3/8" Drive: H7, H8, H9, H10 and H12 1/2" Drive: H14, H15, H17, H19 and H22