🎯 Light up your hunt with precision and ease! Designed for crossbow bolts with a .300" (7.62mm) inside diameter. No assembly required—just insert and shoot! Each nock weighs a mere 25 grains for optimal performance. Enjoy over 48 hours of reliable battery life. Illuminate your hunt with maximum light transmission. High visibility 48+ hours battery 0.300" ID The 6PCS Lighted Nocks for Crossbow are designed for effortless use with a .300" (7.62mm) inside diameter, providing high visibility and long-lasting battery life, making them perfect for archery hunting at any time of day.