What is this? A tool? Shelf hardware? Something else?
This bracket or tool made from steel bar
tools
Related Solutions
Sounds like a non-conductive soil probe.
There are a mix of tools, #1, 8, 9 and 12 are center punches for marking metal prior to drilling. #2, (bent) 5, 6, 10 and 11 are drifts for driving pins, compression pins, door hinge pins too. #3 and 4 could be nail sets for driving finish nails below the surface of wood, but I cannot see the tip which should be "cupped" if they are a good set. #7 is a chisel of a sort, whether it is used for masonry or other hard material, it is very small and the grind on the tip almost makes it look screwdriver like, though it does not seem likely.
Best Answer
It's a single support for a staging plank.
It would require at least one more like it (plus a plank to run between them) to be useful.
The angled slots suggest specifically for holding a toe board (keeps workers from sliding off the edge) at the edge of roofing work, since that allows the support to be shingled over and removed without direct access to the nails holding it in place, but it's not (what I would call) a "Roof Jack" with a similar holding arrangement and a board support that can be adjusted to be level or near level on the slope.
source