Shifting arrow. I use mesh reinforces cutoff wheels in a Dremmel tool. I go through a lot of them to.
jindydiver The knife is pretty flexible. It is M42 Triple tempered Cobalt steel with a hardness of Rockwell C-69. This material is used to cut hardened heat treated steels and stainless. It's made of Carbon, Tungsten, Molybdenum, Vanadium, Chromium and Cobalt.
I am not a metallurgist. I may have been sold a bill of good but it sure is hard stuff. The sparks are white as snow.