TIME-SERT 0142SP 1/4-32 Inch Glow Plug Thread Repair Kit special length for 1/4-32 RC spark plug (GLOW PLUG) kit The steel insert has a length of .180 inches with a copper coating for heat. The kit will repair any 1/4-32 stripped glow plug that is .180 inches or 4.6mm. Kit includes drill, counterbore, tap, install driver and 5 inserts & sealer. The glow plug will now seal on the inserts flange preventing blow-by.