As the name suggests, the side pieces of a D snaffle have the shape of a D and can therefore not be easily pulled through the mouth. As the name suggests, the side pieces of a D snaffle have the shape of a D and can therefore not be easily pulled through the mouth. A single broken bit has a pivot point in the middle which creates pressure on the lips, layers and sides of the tongue. A single broken bit squeezes the tongue slightly when pressed and gives less pressure on the tongue.