7/16" hinge port. 8" cheek, 5" mouth and 1-1/2" port height. This stainless steel cavalry no pinch ball design has a great new look and feel. It has a little more weight to provide extra leverage and more whoa. This mouthpiece is effective for a horse that drops its shoulder. In competition, this bit offers good tongue relief and more stability than a snaffle while allowing good control. This is a great bit for competition, speed events, and for everyday riding