horses. The port or straight piece goes inside the mouth, and the circular part lies under the jaw. The bit is attached to separate head piece or the head collar and the lead is clipped onto the bit and headcollar to limit the severity.
** Tattersall ring bit
** Straight bar bit with horseshoe-shaped cheek pieces

Bits are further described by the style of mouthpiece that goes inside the horse's mouth as well as by the type of bit ring