Tool-Flo 1271363 Helical Flute Thread Mills; Material: Carbide ; Thread Size (mm): M2.5x0.45 ; Thread Type: Internal ; Shank Diameter (Decimal Inch): 0.2500 ; Cutting Diameter (Decimal Inch): 0.0770 ; Length Of Cut (Decimal Inch - 4 Decimals): 0.3000