Ah, yes. The Metal Brain Teaser Puzzles!

The level of frustration one can get from them is as famous as the old Rubix Cube. (I can't even solve THAT dang thing.) I actually learned to make teasers like this once back in Junior High. They are SO simple to make and SO tough to figure out.
Of course, I'm sure the answer is on the internet somewhere. Just Google and there's a good chance it'll pop up.
