I recently acquired a large group of old tools. In my initial "go through" I ran across these two neat pieces - a split nut screwdriver that fits in a brace, and a small pocket screwdriver. Both tools are made from old, worn out files. You can still see some of the file teeth on them.

Cool tools, wonder if they were re-tempered to shape them?

Some of the best cutting tools I have were made from old Files...
Old hollow grind Knife, scraper/deburrer...

Oldtools    Files along with all tools steels when reheated lose their hardness long before reaching forging temperature of 1470 -2000 degrees. Both those tools have been forged (hammered) to the shape the maker wanted. They then would have been re hardened and tempered (two steps) to give them a suitably hard and tough working end.
Graeme

Thank you, that's what I figured the 2 needed to be hammered & reshape,
as they are just drivers, maybe still soft & not heated & tempered. 

My knife & scrapers were ground to reshape, kept the heat low by dunking in water during the hollow grind process, so the edge can cut steel..

Another tool made from a old file is a shrinking slapper, works like a autobody hammer.

What's the side view look like?  How is a shrinking slapper used? like a spoon?

Well spoons tend to be heavier, they  can be used to hit the metal or back it up like a dolly. This slapper is "S" shaped  the serrations are left on as to grab the little bumps better, they can be ground smooth. This is a finishing tool  not what you use to block / rough out accident damage.  The other slapper are made from misc hot rolled stock, handle angles are different, there are times to properly smooth a part you have to hit from a specific angle toe shrink the metal into it's self. Stretching thins the metal and shrinking thickens.
2nd pic is of 3 commercial spoons (Fairmont porter-ferguson) and a shop made. I tend to put longer handles cause of my short arms or just to lazy to move over....

Thank you for the reply... Nice set of tools...
looks like you annealed your slapper to shape it, did you harden & temper it? don't want it too brittle like a file, but hard & tough... How?

The old coal forge is what I used,  heat till red,  bend,  usually one end at a time allow to cool slowly,  that seems to do the trick. I don't hammer anymore do to bad shoulders. We don't need hard cause we a working sheet metal, and it is a finishing tool not a roughing tool.