This thread repair kit fits the m12x1.25 hole I needed to repair. The supplied drill is scrap, the cutting edge is serrated and blunt. Don't worry, I ordered another 31/64 bit version from Irwin and it worked great. I can't complain about the rest of the set. I was able to tap new threads and install the insert with no problem. I didn't use her punch to break the tab on the insert, instead I used fine jawed pliers and broke them pretty well. Overall good value for money.
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