Adjusta bits are perfect bits for trainers or for growing horse because "they adjust".   Horse Tack Co has all the styles adjusta bit, gag bits, training bits, eggbutt snaffle bits, full cheek bits, rubber mouth, kimberwick, wonder bit, western bits and walking horse bits. They adjust from approximately 4 1/2" to 5 1/2" making it easy to fit almost any horse perfectly by just rotating the shank. Once adjusted and attached to the bridle the Adjusta bit can no longer twist. This assures that the bit will remain in the position it was adjusted to. These bits do not pinch and in fact work exactly as the pinchless bits invented by Dave Robart a well known trainer.