1. If you need to clean or re-thread damaged or jammed pipe threads, look no further than our NPT Thread Forming Taps. 2. 1 pcs NPT Pipe taps used for clean and or re-thread damaged or jam pipe threads, Cuts internal threads in pipes. It is used for the repair of rusted, broken and slippery threads of water pipe joints. They are available in National Pipe Taper (NPT) and come in the following sizes: 1 or 4inch - 18 npt, 3 or 8inch - 18 npt 3. Nominal size of the tap is that of the pipe fitting being tapped. Our pipe taps feature a square universal chuck that can be used with either a manual wire twister or a tap machine, making them convenient and fast to use. The round with square end and straight flute tools allow chips to collect in the as they cut, making them well-suited for most applications in shallow cuts. 4. The thread is standard, clear, and the cutting resistance is smaller than that of ordinary taps, which is the for through-hole processing. Standard tooth spacing, no teeth, no burrs, making repair and maintenance a breeze. Slotted in the front section, chip removal in the upper phase, easy to repair, through holes and blind holes are available. 5. This flute threading tap is the perfect gadget for or cleaning, re-threading, milling and repairing damaged or jam pipe threads. They can also be used for creating new threads and rethreading Material: steel colour: yellow Package Contents: 1 x NPT 1 or 4 Pipe thread taps Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.