Our 'U' shaped Primitive Rifleman's Turn Screw (screwdriver) is hand forged, tempered steel.
Sometimes called a "J Tool" or "J-Tool", this popular design was widely used over many decades and centuries. They are shown in #BOOK-GT-V1 "Gun Tools, Volume 1" and #BOOK-GT-V2 "Gun Tools, Volume 2".
You may gently cold bend the handle, in a sturdy vise, to fit inside a narrow patchbox lid, or conveniently carry it in your hunting pouch.