Yeah that's a set I can't do without. I'm currently using my third one though a lot if not most of the previous two sets are still around. FYI Lang (formerly Kastar) is the OEM of those 40 and 48 pc thread restorer sets and they get rebranded as Craftsman, Matco, Snap On, etc. If someone is shopping for a good price on one it can pay to check around. I think snap-on still sells the pieces individually too, or they used to at least when no one else did, though for the price of a few you could find the whole set branded as Craftsman or whatnot.
Does Snap-On lifetime warranty them if you buy the set from a dealer? I think all the other rebrands incl Lang themselves consider them consumables.