Something the average horse appreciates greatly...
But no, although, thinking about it, a larger version might do that job admirably...
Had I photographed it from the opposite side it would have given a big clue...
It's a tool to easily crack open 35mm film canisters in the dark so the contents can be loaded into a developing tank.
I'm soon to commence doing my own processing and have been accumulating the kit needed. I'm now just about ready to go. Black and White initially and maybe colour in future...