Gags are related to the snaffle bits but are more severe. They usually employ a lever action which works on the poll and are commonly seen when competing at a cross country event, show jumping or polo. They are illegal for dressage.

There are many variations. Like the snaffle, they can have a straight bar, single jointed or double jointed mouthpieces in addition to a variety of different rings/cheeks, but these are often specific to that type of gag.

Gag snaffles should be used with two reins in a similar way to the pelham. To use a type of bit like this with one rein does not allow any reward if the horse behaves, or give the rider any other option than employing the lever action. If a rein is attached to the snaffle ring and then a ring below, the rider has the best of both worlds.

Gags are very severe and if used inconsideratly can cause a lot of problems. That said, if used correctly and sypathetically, they can provide the rider with a further degree of control. Gags should only be used by very experinenced riders.