Try to make the very edge a little rough and the convex part smooth it will take some practice but it works well. It won't make the fancy push cuts in a sheet of paper but in real life work like cardboard rope wood and other stuff it shines. I was working with a guy doing straw and the bailer bound up he needed my knife to clear the tangle. He said it was the $$@&!&? Sharpest knife he had ever seen and used. And this guy carried a folding knife that used the interchangeable razor blade.