Carmex Thread Mills Carbide Mini Type - UN (UNC UNF UNEF UNS) - 5/16 x 18 - MT7The Carmex Thread Mills Carbide Mini Type is a compact, high performance threading tool designed for machinists who need fast, precise internal and external threads in deep holes. With a 5 16 x 18 UNC size and an MT7 shank, it delivers reliable performance across materials at medium to high cutting speeds. Thread forms and access: Supports UNC, UNF, UNEF, and UNS thread forms and can machine both internal and external threads with the same tool.