This is a custom Marking Knife I made for woodworking. Instead of a pencil to mark a cut, a knife is used. It gives a more precise mark and cuts the wood fibers to prevent tearing. Bill Stroman made the blades for me. The handle is made of maple and walnut. The cap is held on by a rare earth magnet. It took a lot of sanding and shaping after the profile was cut out on the bandsaw. The finish is 5 coats of spray lacquer.
You can make a knife with a sharpened hacksaw blade. This is much more elegant.