Winning Tongue Plate Loose Ring Bit with Normal Plate has joint and arms that do not hinge downward thereby preventing pain to the roof, tongue, and bars. The 11mm low profile gear casing prevents roof rubbing, and the flat plate prevents bit pinching and reduces bit pressure by 85%.Used in all riding disciplines.Material: Stainless Steel5" and larger have 67mm rings4-1/2" have 45mm rings4" have 40mm rings(Dressage riders would use the smaller rings when using a double bridle)