Public service announcements. Please don’t use these.

It's pretty easy to chip a razor blade and where you think that ends up , that's why carbide is my go to.
I could see that happening if you are using a holder and getting after it. I just use them in my hand though I have to admit it is slow and my 60 year old hand don’t like it. Never have broken one unless I really put a bend into it but I only put bends into them when carving out paint runs.