Korsteel Thin Mouth Flat Ring Eggbutt Snaffle. The Korsteel Eggbutt Snaffle has a nutcracker action which acts on the tongue lips and bars of the horses mouth. The thinner mouthpiece of the bit reduces the surface area in the mouth and so can make the action of the bit more severe. The fixed flat ring on the Korsteel Thin Mouth Flat Ring Snaffle helps to prevent the bit being pulled through the horses mouth, offers more stability for horses that do not like the movement of a loose ring and also stops the bit chaffing the sides of the horses' mouth. Read more… The Korsteel Thin Mouth Flat Ring Snaffle is made from stainless Steel.