Tool-Flo 1271270 Helical Flute Thread Mills; Material: Carbide ; Thread Size (Inch): 1-1/2-12 ; Thread Type: Internal ; Shank Diameter (Decimal Inch): 0.6250 ; Cutting Diameter (Decimal Inch): 0.6250 ; Length Of Cut (Decimal Inch - 4 Decimals): 1.630