Spark plug thread repair kit M12 w/ drill

Includes 16 thread inserts, 8 each for short and for long spark plug threads, so as a die / cutting tool to remove the old thread. With this repair kit you can renew defective M12 spark plug threads. With the enclosed die, the old spark plug thread is removed and at the same time cut a suitable thread for the thread inserts, screw in the repair sleeve, ready!