Hello Matthieu, I am a production support engineer at Xometry. You mention high-speed steels, HSS type, which indeed do not appear as such in our list for pieces made by CNC machining. We carry out many orders for various customers with high-strength steels, such as 90MnCrV8, 20MnCr5, stainless steel 17-4PH, and many others. For some, a core hardening or carburizing allows to increase the hardness and/or resistance, and we can also make manual quotes if you need an alloy or a post-treatment that does not appear in our standard list. Please note, however, that Xometry is not specialized in making Mill or Turning plate type tools, but for special tools, we have partners in our network who have precision milling and turning tools, which will probably be able to meet your needs. Do not hesitate to consult our sales team in this regard. I hope this can help you, do not hesitate if you have other questions. Pierre-Yves Huet