Professional's Choice D Ring Bit Three Piece SnaffleThis D ring is made from 5 16 diameter material and has an outer diameter of 2 7 8. This D ring is slightly more compact than a normal 3 1 2 D ring. The 5 16 material adds a little more weight which helps the stability and release. The mouthpiece is made of 1 2 sweet iron and has three equal breaks. This allows for tongue relief, while intensifying the pressure on the outside of the bars. Mouth: 5 1 4 Rings: 2 1 2 SKU: PCB 98A