Check the size on the tap and Inserts;. 1PCS M16 x 1.25 thread tap. Slightly run the tap into the hole, from the bottom tapered cutting edge, to the correct depth by hand or on a machine tool of 3/8"" square drive;.
This product would be ideal for automotive repair professionals who require a single set of spark plug repair tools featuring M14x1.25 and M16x1.25 inserts and taps, saving time and simplifying maintenance tasks.