Irwin 1903 tap 1/4"-18npt taper

Taper Pipe Taps (HCS)
•  Cuts internal threads in pipes
•  Nominal size of the tap is that of the pipe fitting being tapped
•  Available in National Pipe Taper (NPT) and British Standard Pipe Taper (BSP)
•  Ideal for pipe fittings
•  Tapered at a rate of 3/4" per foot