Nockturnal Helios Gt Nock - is currently on backorder. You may still purchase now though and we'll ship as soon as more become available.
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. Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none. Shoot it at dusk, and with 20+ hours of battery life, you can still find your arrow the next day.