Thanks for posting this George. That explains why when I used one to touch up my LN dovetail saw (1095 steel) it wore out obscenely quickly. The Nicholson's I've used seem to work ok in vintage saws, but i was blown away by how quickly the newer steel wore it down. I ordered a couple Grobets from TFWW for my next couple saw projects, and it will be interesting to see how they compare.