Be nice to see a pic of them Boyan. Its not uncommon for shanks of that kind of tooling to be soft ish and are often are tough rather than hard, depends on manufacturer and quality but sometimes hard is not good and its promotes resonance rather than curing it. Most cutters like that you can't plunge with. but are perfectly capable of ramping and helical ramping to get the tool down if the machine will allow and take the load.