08-25-2010, 04:53 PM
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Both bits are ring bits, commonly used on racehorses. The function is to keep the horse from clamping their jaw down tightly on or grabbing hold of the bit. The top portion of the ring actually goes in the horses mouth along with the bit, and pputs pressure on the roof of the horse's mouth if he tries to clamp or grab.
More commonly seen used in exercise in the morning, only occassionally seen out on the track in the afternoon.