Ballista 8.8 mm Crossbow Lighted Nocks - Pack of 3 Yellow. Designed to fit crossbow bolts with a 0.300in (7.62mm) inner diameter these lighted nocks offer maximum light transmission and high visibility making it easy to locate your arrows even in low-light conditions. With no assembly required you can use them straight out of the package. Featuring a long battery life of over 72 hours these lightweight nocks are built to last. They are bow string activated with an easy-to-turn-off switch ensuring convenience and reliability on every hunt. For the best performance pair them with PIERCER Ballista bolts. Specifications for Ballista 8.8 mm Crossbow Lighted Nocks - Pack of 3: Manufacturer: Ballista Battery Type: CR425 Lithium Metal Features of Ballista 8.8 mm Crossbow Lighted Nocks - Pack of 3 High Visibility LED Nocks: lighted nocks ensure you can easily find your arrows even at night or dawn Fits 0.300 in ID Crossbow Bolts: Specifically designed to fit crossbow bolts with a 0.300 in (7.62mm) inner diameter and an outer diameter (OD) of 8.8mm providing a perfect fit without any prep work needed Long Battery Life: With over 72 hours of battery life these nocks offer long-lasting performance while remaining lightweight at just 25 grains each No Assembly Required: Ready to use straight out of the package just insert the nock into the shaft and youre ready to shoot Bow String Activated Switch: Features an easy-to-use on/off switch for maximum convenience with a clear plastic design for maximum light transmission Compatibility: These nocks are not suitable for BALLISTA STING bolts but they are compatible with BALLISTA PIERCER bolts Package Contents: Ballista 8.8 mm Crossbow Lighted Nocks - Pack of 3 Ballista BAL-LN-01-Y: 8.8 mm Crossbow Lighted Nocks - Pack of 3 Yellow