Nockturnal-GT Lighted Nocks for Arrows with .246 Inside Diameter including various Gold Tip Arrows HIGH VISIBILITY and LONG LASTING LITHIUM BATTERIES - Shoot it at dusk, and with 20+ hours of battery life, you can still find your arrow the next day. RELIABLE - Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none. NO ASSEMBLY REQUIRED - Nocks can go straight form the package to the shaft in fully operational condition. No prep work needed. Just insert it, and you are ready to shoot. FITS GOLD TIP ARROWS - with an inside diameter of .246 THREE PACK GREEN NOCKS - Also Available in Red, Pink and Blue