Tool-Flo 2468807 Helical Flute Thread Mills; Material: Carbide ; Thread Size (mm): M6x1 - M8x1 ; Thread Type: Internal ; Shank Diameter (Decimal Inch): 0.2500 ; Cutting Diameter (Decimal Inch): 0.1830 ; Length Of Cut (Decimal Inch - 4 Decimals): 0.55