High quality 9 pc. 1/4 inch hex-drive metric-socket bit set Includes sizes 5, 5.5, 6, 7, 8, 9, 10, 12 & 13mm Sockets are constructed from Chrome-Vanadium (CR-V) alloy steel for excellent strength and durability Magnet inside sockets retains bolt head or nut in socket Durable black finish Includes convenient holder to keep bits organized For use with quick release drivers only Not compatible with 08-0556 Spinner T-Handle Bit Driver