TEKTON 4911 3/8-Inch Drive Impact Star Bit Socket Set, T40 - T60, Cr-V, 6-Sockets Designed for use with impact drivers Made from high-strength chrome vanadium steel Black phosphate finish resists corrosion Tips are precisely milled for exact fit in fastener 6-pc. 3/8 in. drive star sizes: T40, T45, T47, T50, T55, T60