Never lose your arrows with the easy-to-find Nockturnal-GT Lighted Arrow Nock. This nock can go straight form the package to the shaft in fully operational condition. No preparation or tools needed. Just insert the nock and you are ready to shoot. Piston-driven contact switch ensures LED illumination every time. Waterproof and shock resistant design. Features a full 20+ hours of battery life. Fits arrows with an inside diameter of .246, including Gold Tip Hunter, Gold Tip Kinetic, Gold Tip Velocity, and more. Package of 3 nocks.