A Bit Shank is the bar that has a ring that attaches to the bridle headstall at the top (headstall loop), the bit in the middle and and the rein ring on the other end. The length of the shank is important, as the longer the shank below the bit (lever), the more pressure is applied to the horse’s mouth with less rein pressure from the rider. However, longer shanks must rotate before applying pressure, and in doing so give a horse “warning” of the needed action BEFORE pressure is applied (signal). Thus, a horse can be sensitized to light cues as his training progresses.
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Rider’s with heavier hands should use shorter (or no) shanks. Rider’s with small, soft, or light hands can use longer shanks.