I bought the set for a one-time use of this odd size (M13x1.5). Price was right at about 1/3 the cost of other taps but the steel isn't top quality. The worked well to cut the threads I needed in cast 6061 aluminum. They came out clean, sharp and accurate but I don't think the taps will hold up for the long haul.They're a very good value for limited use. If you need to cut a lot of threads or plan to keep them for years, you'd be better off spending more and getting better quality tools.
Rating:
[4 of 5 Stars!]