Thread File restores damaged threads. Modern nuts and bolts are often cheap enough to replace, but what about captive threads or threaded components? In some cases a damaged thread can render a part useless. But it is possible to save threads with thread file. By running it carefully along the threads, the file will reshape the thread pattern and restore it, removing any damage or burrs. Pitch: 11-12-13-14-16-18-20 and 24 (TPI)