STM, 123380, Spiral Flute Tap, UNC Thread Standard, 1/2 to 13 in Thread, 2.5P Plug Chamfer, 3 Flutes, HSSE-V3, Black Oxide, 0.769 in Thread Length, 3-3/8 in Overall Length, Right Flute Direction, Steels & Other Materials Up To 35HRC Material Application, Through Coolant (Yes/No): No