Shires Eggbutt Snaffle Bit has a French link which applies pressure to both sides of the tongue. This is great for horses who do not like a nutcracker action. The Eggbutt feature minimises pinching on the edge of the horse's mouth which can occur from a loose ring snaffle. The Eggbutt also provides a stiller action in the mouth which is ideal for horses who are unsure of the bit. This bit is made from stainless steel which is durable, easy to clean, tasteless and does not rust. Size Guide Available in widths: 4.5", 5.0", 5.5" or 6.0". Mouthpiece thickness: 14 mm. Cheek height: 55 mm (for 4.5" width) or 75 mm (for 5.0", 5.5" and 6.0" width).