Fangrui Product Details 1. If You Need To Clean Or Re-thread 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 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: 1/4inch - 18 Npt, 3/8inch - 18 Npt 3. Nominal Size Of The Tap Is That Of The Pipe Fitting Being Tapped. Our Pipe Taps 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 Shank With Square End And Straight Flute Tools Allow Chips To Collect In The Flutes 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 Bad Teeth, No Burrs, Making Repai