This high quality medical device is used by dentists and doctors to keep the mouths of their patients open during procedures. The hinge has a ratcheting feature that securely holds the gag open once you set it into place. Just press the lever to easily close the gag. A twist on our classic Jennings Gag, our newest version has a black rubber coating, for comfort as well as to keep the gag from slipping. Measurements: 8 inches in total length, gag measures 5.75 inches in width, opens to 2.5 inches. Material: stainless steel, PVC.