3/8-inch socket set. Chrome vanadium alloy steel for strength and durability. Recessed edges with openings designed to reduce fastener rounding. Polished nickel chrome plated finish. Lifetime warranty. SAE shallow socket sets include: 1/4", 5/16", 3/8", 7/16", 12", 9/16", 5/8", 11/16", 3/4", and 13/16", sockets. SAE deep socket sets include: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16#34;, 3/4", 13/16", 7/8", and 15/16",sockets. Metric socket sets include: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, and 19 mm sockets.