The 30-06 UFO Lighted Nock is engineered for serious archers seeking improved visibility during their shots. These nocks, designed to fit arrows with a .166 diameter, feature ultra-bright LEDs and require no assembly for easy use. With over 20 hours of battery life and a waterproof design, they are perfect for a range of conditions, ensuring effective performance whether practicing or hunting. This package includes four lighted nocks, providing extra value for your archery needs.