If the expanse isn't expansive enough, the Fetish Fantasy Extreme Spider Gag will do the job!
This extreme gag consists of a steel ring with four curved metal legs attached to the ring. The gag and legs prevent the mouth from closing, leaving your subject's mouth wide open for anything you wish to place inside.
The ring measures 1.5 inches in diameter, and the gag is attached with a leather strap that bends at the back, holding the gag firmly in place.
