M14 x 1.25 mm Spark Plug Rethread Repair Tap Tool Thread Reamer Inserts Kit ⇓
Spark plug size: M14 x 1.25mm. 5pcsx M14 x 1.25 - 11.2mm. 5pcsx M14 x 1.25 - 17.5mm. Spark Plug Re-thread Repair Tap Tool Set will be your good helper. Standard bit and tap are required for installation.