AACCKK! In an Armstrong holder on top of that! BLASPHEMY! You are SO FAR behind the times. Most of my HSS are MoMax Cobalt that I've had for decades. I often wonder if the new HSS inserts and bits some vendors are peddling are actually made in far off Guangdong province. This is the cheap stuff that looks nice and shiny but cuts for crap and dulls in a short time. Hmm, reminds me of a trick we used to play on the new guys when they had trouble with a tool bit on a lathe. Someone would have a piece of cold rolled surface ground and profiled to look like a turning tool. We'd tell them this tool will cut anything. They'd put in the holder, hit the workpiece and the bit would promptly turn blue then red and melt. Someone would say, let me try that tool on my machine but pull a switch and it would cut like butter. The noobs would be scratching their heads the rest of the day. Ah, the good ol' days.