The Classic Equine Goostree Quick Draw Dr. Bristol Gag Bit can adjust to many different settings in the gag length or the shank length. Gag length is variable by adjusting the headstall length from 0'' - 3''. Two rein rings allow for either 6'' or 7-1/2'' shank length. Excellent bit for collection at speed and teaching vertical flexion at many different levels, while the versatility and adaptability make the Quick Draw an excellent addition to any collection.