Features and Benefits:�Includes (4) 1/2" drive and (3) 3/8" drive bits, (2) 1/4" drive bits, and (1) steel storage rail�1/2" drive bit sizes: M12, M14, M16, and M18, 3/8" drive bit sizes: M6, M8, and M10, 1/4" drive bit sizes: M4 and M5�S2 alloy steel bits for strength and durability�Made of chrome vanadium sockets with corrosion-resistant plated finish9-Piece Triple Square XZN Bit Socket Set includes (4) 1/2-Inch drive, (3) 3/8-Inch drive, (2) 1/4-Inch drive bits, and steel storage rail. The sizes for 1/2-Inch drive bits are M12, M14, M16, and M18, sizes for 3/8-Inch drive bits are M6, M8, and M10, and sizes for 1/4-Inch drive bits are M4 and M5. The S2 alloy steel bits provide strength and durability and the chrome vanadium sockets have a corrosion-resistant plated finish. This Triple Square XZN bit socket set is made in Taiwan.