This 6 piece set offers a useful selection of Powerbuilt SAE combination wrenches constructed from tough heat-treated steel for strength and durability. Other features include a knuckle-saving 15 degree offset on the open end and Z-Drive hex design on the box end that contacts the flat walls of fasteners instead of the corners for stronger grip. Precision built and affordable, Powerbuilt products meet or exceed ANSI standards.Set includes 5/16", 3/8", 7/16", 1/2" and 9/16" wrenches crafted from premium heat-treated steel for strength and stiffness 15-degree offset and chamfered openings for easy mating to fasteners. Lifetime manufacturer warranty 6 Piece SAE Combination Wrench Set