Nockturnal Lighted Nocks Model-GT Green 3pk NT-105

HIGH VISIBILITY LIGHTS - Shoot it at dusk, and with 20+ hours of battery life, you can still find your arrow the next day. NO ASSEMBLY REQUIRED - Nocks can go straight form the package to the shaft in fully operational condition. No prep work needed. Just
20+ hours of battery life
Fits arrows with Inside Diameter of .246
Piston driven contact switch ensures L.E.D. illumination every time
Waterproof and shock resistant design is second to none
No assembly required