... why in the heck you need would ever need to put this on a horse's head?!
This device is called a Horsewyse Hackamore. The patent for this contraption is held by Patrick Wyse. Although, it is not mentioned or pictured anywhere on his website. It's actually pretty difficult to find anything further about. I wonder if they maybe.. I dunno... caused horses to flip over and kill people? The combination of extreme leverage from the hackamore and a tie down spells T-R-O-U-B-L-E!