I'll use the original Black Diamond and Pre 1980's Nicholsons as these run around 1.25% carbon and make excellent blades. I haven't had a lot of luck with Simmons but I've been told the old ones are similar to the old Black Diamond and Nicholsons, other files are a crap shoot. Some are real good, others are case hardened. Even some rasps and files from reputable makers can be case hardened so it's a good idea to test them before investing the time to make a knife.
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