Drop forged, heat treated alloy steel. High polished, chrome plated. Precision machined open and boxed ends. Heavy duty roll-up vinyl pouch. Sizes - MM (7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 18mm, 19mm, 22mm), SAE (1/4”, 5/16”, 3/8”, 7/16”, 1/2”, 9/16”, 5/8”, 11/16”, 3/4”, 13/16”, 7/8”, 1”).