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;.
Universal 1Set Spark Plug Thread Repair Tools W/ M12x1.25 Inserts & M14x1.25 Tap
Universal 1Set Spark Plug Thread Repair Tools W/ M14x1.25 Inserts & M16x1.25 Tap
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