What is this?

Hahaha true!! I found it in a pile of ps and alt brackets that I have, so I took it to work and media blasted it. If I could find out what the heck its for, then I may be able to sell it lol. I'm trying to get rid of everything I dont need...my ocd is horrible lately and its hard for me to concentrate on my project with all these oddball parts lying around! lol.