Spark Plug Back Tap Thread Repair Tool 260mm M12 1.25mm Thread 

• Chases from within, to reduce debris contamination into the cylinder head

• Collapsible chaser head thread repair design reduces the diameter of the reamer to allow it to actually bypass the damaged thread & enter the cylinder to chase the thread from the inside to the outside

• Inside to outside thread repair method reduces the chance of swarf & debris entering the cylinder

• Easy & safe thread repairs