Performance Tool W38886 6 Piece 1/2 Drive Large Hex Bit Socket Set 3/8", 1/2", 9/16", 12 mm, 14 mm, 17 mm, NULL 3 SAE Large Hex Bit 1/2 Drive Sockets: 3/8", 1/2", 9/16" 3 Metric Large Hex Bit 1/2 Drive Sockets: 12mm, 14mm, 17mm Chrome vanadium alloy steel construction for strength and durability, Heat treated for strength Bonus storage rail included. Polished nickel chrome plated finish resists corrosion.