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I think the Black Diamond files are 1.3% carbon steel (C130).
The current Nicholsons being 1095, but their heat treat SUX. The stuff from Mexico and Brazil is horrible. Bends in both axes (yes that is the plural of axis, strange right?), teeth that are dull to begin with, rows of teeth not even aligned properly, and BAD heat treating.
USA made Nicholsons (new old stock) are the ones to buy if you have to go Nicholson.
I will admit, it's been a couple years since I've looked at a current production Nicholson file, but the ones I was using a few years ago were crap. Went to Simonds brand files, along with Pferd, and haven't looked back.
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