Century Drill & Tool 92942 Restoring File, High Carbon SteelRestores damaged threads that are bent, rusted or cross threaded. For use on screws, bolts, studs, pipe and pipe fittings. Highlights: Material: High Carbon Steel Metric or SAE: SAE Tap Size: 9. 32 TPI Restoring size 9, 10, 12, 16, 20, 27, 28 and 32 threads per inch Can be used as a pitch gauge Oxide coated to prevent corrosion WARNING: This product and the dust created by its use may contain chemicals including lead known to the State of California