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 insert it and you are ready to shoot. MOST RELIABLE LIGHTED NOCK - Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none. LONG LASTING LITHIUM BATTERIES - Shoot it at dusk and with 20+ hours of battery life, you can still find your arrow the next day. Nockturnal – X Fits Arrows: Trophy Ridge - Crush, Blast, Hail fire, Wrath; Carbon Impact; HOT Shaft XLT; Easton - ST Axis, Full Metal Jacket, ST Axis N-Fused Carbon, ACC (w/X-UNI Bushing); Beman - MFX Bone Collector, MFX Real tree, MFX Classic. FITS ARROWS WITH INSIDE DIAMETER OF .204. Green. Flat Nock. 3 pack. Model NT-707.