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. The most reliable Piston driven contact switch ensures L.E.D. illumination every time. Shock resistant design is second to none. Long lasting battery Shoot it at dusk, and with 48+ hours of battery life, you can still find your arrow the next day. What You Get 6×Lighted Nocks 1×Screwdriver

Has a plunger to activate the light, hole on side to turn off. Fits bolt size .300'' I.D. 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. HIGH VISIBILITY and LONG LASTING LITHIUM BATTERIES - Shoot it at dusk, and with 48+ hours of battery life, you can still find your arrow the next day. Half moon style Lighted crossbow nock.