I call a similar tool a knapping awl. Mine is made from a 16 penny nail. The steel in the nail is soft and doesn't draw sparks. The knapping awl can be made from a brass rod and is equally effective. A knapping awl is really good for when you are knapping the flint while held in the jaws of the hammer.I was at a shoot one day I was trying to beat on this Flint to get a new edge on it.
Fellow shooter and a friend who was a machinist comes up to me and hands me this little tool.
One edge just little chips, big edge big chips. Just set it right down the edge, tap it easy & it will flake right off.
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Stainless steel