The UFO G Series Lighted Nock provides exceptional arrow tracking with bright green LED illumination in a .166" diameter design compatible with 30-06 arrow shafts.UFO G Series Lighted Nock - 3-PackGreen LED illumination for enhanced arrow visibility.166" diameter for precise arrow shaft fit30-06 arrow compatibilityCompact dimensions: 0.55 x 4.25 x 5.50 inches (package)Ideal for bowhunters and target archers who need reliable arrow tracking and recovery especially in low-light conditions or dense cover.