Resembling a bit guard is a bit burr (sometimes burr bit, also bubble cheeker in Australia), which has teeth laid against the horse's cheek. ... Bubble cheekers are approved for use in thoroughbred racing in Australia.

What do bit rings do?

The bit ring is the ring on the side of a horse's bit, particularly on a snaffle bit. It is used as a point of attachment for the cheekpieces of the bridle and for the reins. It also has an effect on the action of the bit.

What does a Tom Thumb bit do?

The Uses of a Tom Thumb Bit

Because it is jointed, it has a nutcracker action in the mouth. Combined with the leverage action provided by the shanks, the bit will apply pressure to the horse's head over the poll and under the chin as the curb chain or strap pulls upward.