10 sizes available piece for convenience and versatility (including sizes 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8"). 10 piece set includes all sizes listed above and convenient holder. Heat-treated and tempered for extra strength and durability. Exceeds ASME/ANSI specificati