Tool-Flo 1270984 Helical Flute Thread Mills; Material: Carbide ; Thread Size (Inch): #8-32 - #12-32 ; Thread Type: Internal ; Shank Diameter (Decimal Inch): 0.2500 ; Cutting Diameter (Decimal Inch): 0.1260 ; Length Of Cut (Decimal Inch - 4 Decimals):