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Chrome vanadium steel for strength and durability • Heat treated for consistent hardness • Precision broached jaws for sure grip • 12 point box end for snug fit • Thin walled construction for access in tight quarters • Meets ANSI standards • 3/8”, 7/16”, 1/2”, 9/16”, 5/8”, 11/16”, 3/4”, 13/16”, 7/8”, 15/16”, 1”, 1 1/16”, 1 1/8”, 1 1/4”