Irwin Industrial Tools 1921ZR Taper Pipe Tap Set， 6-Piece</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Cuts internal threads in pipes. Ideal for pipe fittings.</li><li>Nominal size of the tap is that of the pipe fitting being tapped</li><li>Available in National Pipe Taper (NPT) and British Standard Pipe Taper (BSP)</li><li>Tapered at a rate of 3/4-Inch per foot</li><li>Includes one taper tap each of: 1/8" - 27 npt， 1/4" - 18 npt， 3/8" - 18 npt， 1/2" - 14 npt， 3/4" - 14 npt， and 1" - 11-1/2 npt. Made in the USA.</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41mZLlQCUaL.jpg' noproxy></br>