-18, UNC, Solid, Outside Dia..1 in, Die Material High Speed Steel, Thread Direction Left Hand, Die Thickness 3/8 in, Finish - Machining Bright (Uncoated) Round Threading Die, Round, Thread Size 5/16 In.
-40, UNS, Solid, Outside Dia..1 in, Die Material High Speed Steel, Thread Direction Right Hand, Die Thickness 3/8 in, Finish - Machining Bright (Uncoated) Round Threading Die, Round, Thread Size 3/8 In.