New Build 1000x600x200mm (newbie)

[Neale]

Those are carbide inserts. Replaceable inserts like those come in different grades of carbide and with different geometry (tip radius, for example) but they are all carbide. Never seen an HSS insert, although someone somewhere probably makes them.

[Boyan Silyavski]

They are carbide inserts right, but i think they should not be treated like a normal carbide cutter. Instead an indexable mill tool should be found in the database and edited correctly.