I think youīre right (english isnīt my native language, so I sometimes have difficulties with technical terms). The bit has the thickness of the blade. I donīt know which alloy it is. Itīs a tool for high speed cutting of bearing steel (100 Cr 6). I got a couple of those tools from a scrap metal container for free.
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If it isnīt broken, it doesnīt have enough features yet.