A plastic mouthed jointed ring bit, a milder version to the stainless steel bit.
The Dexter bit is widely used in racing as it is useful with strong fit horses. The large ring can be used for leading a horse whilst it is tacked up. The jointed feature gives a nutcracker action, but this is limited due to the attatchment onto the larger ring. The extended cheeks help to improve steering and also reduce the risk of the bit being pulled through the horses mouth.