The Performance W1388 10-Piece 3/8-inch Drive Metric Hex Bit Socket Set is constructed of hardened and tempered chrome vanadium steel for extra durability and strength. Features: * Hardened alloy steel bits * Hardened and tempered chrome vanadium steel sockets * Professional sand finish What"s In The Box: * 2mm Hex Bit socket * 2.5mm Hex Bit socket * 4mm Hex Bit socket * 5mm Hex Bit socket * 5.5mm Hex Bit socket * 6mm Hex Bit socket * 7mm Hex Bit socket * 8mm Hex Bit socket * 9mm Hex Bit socket * 10mm Hex Bit socket * Storage rail