The bill angle, length and width is designed for strictly the depth, where the body is designed for the action by resembling the shape of Herring, which includes Gizzard and Threadfin Shad, and giving a similar cadence, resulting in a much user friendly, less tiring lure.
6 to 8ft dive depth: Most common depth, within visible sight, of suspending baitfish and predatory fish aimed to catch in colder months and post frontal situations.
Most Commonly resembling to baitfish in the Herring family (flat sided, as opposed to a round sided smelt), which includes Gizzard and Threadfin Shad, to imitate sound in colder water conditions and in post frontal situations.