I have made marking knives in the past but no longer have them so when I needed to make a mark line other than a pencil line I figured it was time to make one. I purchased some 1/16″ 01 tool steel off of Amazon, found a piece of maple and began to get to work. Fortunately I had some carving knives I made a while ago and used them to shape the handle. I was hoping for a handle that “felt right” in my hand and I believe I accomplished that. The blade is a single bevel with a flat reverse face. I like this kind of knife rather than the ones that are made for the left and right hand separately. Just can’t get my head around the reasoning for needing two knives when one like this works right or left hand. A knife with a single bevel has a tendency to force itself into the straight edge you’re using and to me it’s a bit of a problem because the knife’s sharp edge may mar the edge of the ruler. To help prevent that I put a small back bevel (5 degrees) on the flat side. That corrects the problem. Sometimes I will use the knife in ways other than simply marking a line and is a good reason why I won’t make the blade thicker than 1/16″. In fact one of the marking knives I had was made from a bi-metal hacksaw blade and was a favorite. The thin blade was useful getting into small areas. If you haven’t made a marking knife for yourself I suggest you do so, it’s a worthy endeavor, a pleasure to make and use your own.