KD Tools, 14mm Spark Plug Insert Reamer/Tap, Part #2123Made in USAFeatures and Benefits: •This is used to open damaged spark plugs hole thread inserts •Prior to using spark plug thread, use inserts 2126 through 2129 to repair 14mm spark plug holes on aluminum heads only •Size: 14mm Repair damaged spark plug hole threads with this combination reamer and thread tapping tool. It’s simple to use! Made with the quality and durability to last! Location: Building #2, 2nd aisle on right side