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Mike Blue hardened all mine so he may chime in shortly. They were very hard when he got done! so, of all the smiths, he would know for sure what the cycle hardening and tempering would be best. It...

Those narrower ones finish to about 9/16ths at the max. Buy the widest ones! Still, the steel is great. Very good price, I didn't see them in a catalog for some years now.
~Richard
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