The handled one is 3.5mm O1 and the other is 52100 not checked thickness of this but seem to recall it being 5.2mm.
The un handled one isn't on the site as it was a special AFAIR.
What is the steel on those babies ? FGYT, do you have any more of these ? Is this a one of a kind ?
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The handled one is 3.5mm O1 and the other is 52100 not checked thickness of this but seem to recall it being 5.2mm.