Ironman
Ultra Member
I have a bunch of these and have given some away. A thou over 7/16" and solid carbide, I thought they were a reamer. Being carbide they have to be in something stable like a mill or they chip if you are drilling with them.
That makes sense to meYou might not have any, but there are lots of 4 Flute reamers around. The point may well allow for drilling, but it would also facilitate a quick start. Might be very well suited to reaming non-chip metals like cast iron or bronze.