gagbit with four rings, also called <i>Pessoa gag bit</i>, using the name of the famous brazilian equestrian <a href="https://en.wikipedia.org/wiki/Nelson_Pessoa" class="extiw" title="en:Nelson Pessoa">Nelson Pessoa</a>
<a href="//commons.wikimedia.org/wiki/User:Jebulon" title="User:Jebulon">Jebulon</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>