What Is It? game 223

It's time to play a game in collaboration with the always amusing What Is It? Blog! Do you know what this thing is?

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 each win a 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?

Check out the What Is It? Blog for several additional pictures of this item (including closeups), and more mystery items. Good luck!

Update: the tool shown is a horseshoe calk sharpener, which can used without removing the shoe from the horse's foot. A calk is a spike that is used in icy conditions. See the patent here. And guess what? NO ONE came even close. But LostCrichton summed up that confusion by saying, "Don't quite reckon I know but it keeps the missus happy." As the funniest answer, that one wins a t-shirt! Thanks to everyone for playing this week. Find out the answers to all of this week's items at the What Is It? blog.