Spark Plug Thread Repair Set - M8 x 1.0. M8 HSS Steel Tap with 16mm hex drive. For professional repair of spark plug threads.
Spark Plug Thread Repair Kit – 14mm Reamer Thread Repair Tool &4 Inserts
14mm Back Tap Spark Plug Thread Repair Tool M14x1.25 Thread Chase Tap
1Set Stainless Steel Spark Plug Thread Repair Tool with M10x1.0 Thread Inserts