223 Reinsman 3/8 inch Twisted Dogbone Offset Dee Bit 5 InchDee ring applies pressure to horses cheek on the opposite side of the face from the rein you pull for better flexion. 3 8 inch Twisted Dogbone Snaffle 5 inch Mouth 3 inch Rings Mouthpiece has three features to help control your horse. First, it's twisted to add some bite. Second, the three piece breaks over the bar at a different angle to contact new nerves. And third, the dogbone contacts the tongue for pressure to help rate and set a horse's head.