Sealey Reverse Action Spark Plug Thread Chaser 12mm MS002

General description Sealey Reverse Action Spark Plug Thread Chaser 12mm is specially designed to repair damaged spark plug threads on modern petrol engines. Its unique design allows the tool to be passed through the plug thread into the combustion chamber, then expanded to the correct size starting on the inner, undamaged threads, making it more effective than traditional thread restorers that rely on luck for alignment. Technical specifications Size: 12mm Length: 138mm Model No.: MS002 Other information The first letter(s) of a Denso, NGK, and Bosch plug code indicates the thread size identification. For Champion brand, the second letter(s) of a plug code indicates the thread size identification.