I was thinking along the same lines as pacanis. It is intriguing, but I have to leave for awhile. I'm sure someone will probably get it before I get home!
For fear of being too nitpicky, I'm interpreting pacluckis as correct. It holds two steel rulers to make a square (tool, not shape). If that's not what he was talking about, then consider this the worst hint ever.
This shouldn't be too tough.
I am looking for its specific use. Not just how it can be used generally. It is specialized. Here ya go. (the size is what it is, sorry)