Titan-TT78316-High-Speed-Steel-Screw-Thread-Insert-STI-Hand-Plug-Tap-12--24-H2-Limit-0220-Shank-Diameter-1516-
STI taps are oversized so that they will produce threads that will accept helical coil wire screw thread inserts that have the same size and pitch. For use with aluminum and non-ferrous materials.