I use it for boring holes in high carbon steel, mostly for knives/tools. Pictured above is a horse rasp knife, but I have used it on 4330, 4140, and 1095 steel as well. The rasp itself is a type of W-2 steel (1 and up in carbon content) and has snapped Titanium bits and a few other high speed drill bits. Carbide is the only way to go for what I use on the forge for tools and cutting implements. You do need to understand your speeds and feeds as well as realizing that if the carbide bit flexes it can snap. Otherwise the bit works well for what I have been using it for.
Rating:
[5 of 5 Stars!]