Chrome vanadium steel for strength and durability Precision broached jaws for sure gripping 12-point box end for snug fit Thin walled construction for access in cramped quarters Heat treated for consistent hardness 11 SAE Combination Wrenches: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" Meets ANSI standards