Slackbunny, These are made from an old two-man saw, and are about .075" thick.
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In the process of making them, forging, grinding and such, I noticed they had lost some temper. I do a "whack test" by hitting the edge with an old bone. I re-tempered them so they will sharpen with a stone, but won't blunt over or chip upon impact with something hard, and they work like a champ.
First time out with them, many years ago! Sheesh!!
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Robby