Tool-Flo 1271015 Helical Flute Thread Mills; Material: Carbide ; Thread Size (Inch): 1/2-14 - 3/4-14 ; Thread Type: Internal; External ; Shank Diameter (Decimal Inch): 0.5000 ; Cutting Diameter (Decimal Inch): 0.5000 ; Length Of Cut (Decimal Inch - 4