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Nickel chrome finish for exceptional corrosion resistance. Hollow shafts for clearing long thread applications. Heat-treated alloy steel shaft. Color coded handles for easy size identification. High torque acetate handles for superior durability and solvent resistance. Set includes 1 each: N316A 3/16", N140A 1/4", N516A 5/16", N132A 11/32", N380A 3/8", N716A 7/16", N120A 1/2".