The Korsteel 23mm Hollow Mouth Eggbutt is a very large diameter bit that is soft and light in the mouth. This bit would be suitable for large mouthed horses, but may be uncomfortable for those with a low palate or large tongue.Stainless SteelAvailable in 5 and 5 1/2 inches
The single jointed mouthpiece works by applying pressure to the bars, lips and sides of the tongue. As pressure is applied to the bit, the center joint collapses forward causing the bit to tighten in the horse's mouth and sometimes to contact the roof of the mouth.