Marking knives are sharpened to a knife edge and are used for scribing layout lines that are thinner than pencil lines for greater accuracy. Can be used against a straight edge. These are beveled on one side. Bench knives such as Murphy, Solingen or Flexcut also work well.
Left is shown here.
2951: Right Handed
2952: Left Handed
2953: Set of 1 each: Right and Left