What Is It? game 170

It's once again time for our collaboration with the always amusing What Is It? Blog. Can you guess what the pictured item is? Can you make up something interesting?

Place your guess in the comment section below. One guess per comment, please, though you can enter as many as you'd like. Post no URLs or weblinks, as doing so will forfeit your entry. Two winners: the first correct guess and the funniest (albeit ultimately wrong) guess will win T-shirt from the NeatoShop.

Please write your T-shirt selection alongside your guess. If you don't include a selection, you forfeit the prize, okay? May we suggest the Science T-Shirt, Funny T-Shirt and Artist-Designed T-Shirts?

For another picture showing a close-up detail, check out the What Is It? Blog. Good luck!

Update: To be honest, this week it was hard to tell which answers were honest guesses and which were trying to be funny! just a guess was the first with the correct answer: this is a measuring device for a horse's neck, so collars can be custom-sized. The funniest answer prize goes to The Professor, who called it "Occam's Hooky-Thing" that wasn't quite as successful as Occam's Razor.