Powerbuilt 648887 3/8-Inch Drive Hex Bit Socket Set, 4-Piece Made to be the most reliable tools in the market today Tool solutions for most all situations Built to exceed tool standards Includes 5/16-Inch, 3/8-Inch, 8mm and 10mm bit sockets 6-Inch overall length for hard to reach hex head fasteners.Includes 5/16-Inch, 3/8-Inch, 8mm and 10mm bit sockets Premium S2 alloy steel bits and chrome vanadium sockets Meets or exceeds ANSI standards Lifetime warranty