The UFO GT Series Green Lighted Nock provides superior arrow tracking with bright green LED illumination designed for .246 diameter arrows. This professional-grade nock enhances visibility during flight and simplifies arrow recovery.UFO GT Series Lighted Nock - 3 PackGreen LED illumination for enhanced visibility.246 diameter compatibilityCompact dimensions: 0.55 x 4.20 x 5.45 inches (package)Durable construction for consistent performanceIdeal for hunters and target archers who need reliable arrow tracking in low-light conditions or dense hunting environments. The bright green light activates upon release for maximum effectiveness.