Made from forged alloy steel, this 12-piece set is heat treated and tempered, nickel chrome plated and polished. Inch set has sizes 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16". Includes reversible ratchet handle, 5/8" spark plug socket, 1-1/2" and 6" extensions and metal storage box. Lifetime warranty. Weight: 3.75 lbs.