Nickel chrome finish for exceptional corrosion resistance. 3 In. (inch) 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 In., N140A 1/4 In., N516A 5/16 In., N132A 11/32 In., N380A 3/8 In., N716A 7/16 In., N120A 1/2 In.