What is this hinged tool with a box full of wicked grooves and teeth? Recently, while cleaning out my mother's kitchen, we came across this tool:

When closed, it is about 8 inches long (the box at the end is maybe 2 inches by 2 inches by an inch or so).  The two sides come apart very easily.  The tool is quite light-weight, and seems to be made of aluminum.  Other than that, I have idea what it could be, and there seemed to be no identifying marks or branding.
Honestly, I would not be surprised to learn that it is not even a kitchen tool (my money is on Medieval torture device), but it came from one of the kitchen cabinets, so maybe it belongs there?
This is an ice crusher.

You put some cubes (or use your ice pick to cut a hunk off from a large block), put it in the compartment, and squeeze it closed. Those gnarly bumps and teeth will crush the ice.
I would personally consider it more &quot;home bar equipment&quot; for crushing ice for cocktails, though that's certainly not the only use. As mentioned in the comments, it probably doubles as a decent nutcracker, though that's not it's intended purpose.