The snaffle bit is a standard jaw piece. The rings cannot move loosely, so that the aid comes through more directly and the bit lies relatively still in the mouth. In addition, the bit prevents the lips from getting caught, so that bit rings are not necessary with this jaw piece.
The single-jointed bit has one hinge point, which puts less pressure on the tongue than with a double-jointed mouthpiece. A single jointed mouthpiece mainly acts on the layers, the side of the tongue and can also act on the palate. A single joint mouthpiece is considered a standard mouthpiece.