I generally don't buy "luthiery" tools when their are other alternatives. You can get a higher quality set of end nippers for less money than the stewmac fret cutters. Channellock 357 7" Hand Cutting Nipper End Cutter Pliers Made in USA.
I use a cheap diamond crowning file I got off of amazon that has served me well for years for much less than Stewmac. For leveling I use an aluminum level with a machined edge, with double stick tape and a roll of 3/4" emery cloth, their leveling beam is ridiculous. I could use a set of tang nippers though. I usually file the tangs when I have too.
Yeah, Stew Mac is convenient and does have some truly specialized tools, but much of what they sell are just standard tools you can get somewhere else. They might modify something like a set of end cutter pliers by grinding the face down, or grinding the edges off a triangle file, but nothing you could not easily do yourself.
For leveling frets I use a piece of 1" thick by 2" wide hard maple planed flat with a hand plane and checked for flatness on the skinny edge with a quality straight edge, then apply Porter Cable sticky back sandpaper. I can make different size ones for different length fingerboards and cost is next to nothing.
IMO, the fret tang nipper is more trouble than it's worth. It mangles the end of the frets. I'll take a look around, but I had both sizes and I think I threw them out a year or so ago since I never used them. I posted the router method I use in the thread linked above.
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