I used this set to repair some of the M12x1.5 threaded mounting threads on a Porsche 911 whilst working on jack stands under the car. Easy to use and gets the job done. I recommend using the Time Sert tap guide so you can start cutting new threads straight and the compact sliding lever tap handle. I had no problem fixing a hole with a large tap handle gap, but I screwed the threads in the second hole because I didn't have a large tap handle gap and the threads started cutting at an angle to the hole. After that I had to switch to the Big Sert kit.
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