Excalibur Archery gear and accessories are made to not compromise valuable comfort through the hunting experience; The Illumination of Exacalibur's Beacon Nock has an easy activation by only a Shot; Provides an illuminated path to the target and will assist in arrow location; These Nocks fit any arrow with an inside diameter of .300"/7.62 mm, so your archery crossbow can be fully equiped and ready to hunt; Incorporates Aluminum Rhino Inserts that are made to maximize durability; Lighted Durable Beacon Arrow Nocks are packed in a number of 3; Ever since we began Excalibur in 1983, it's been our aim to help crossbow hunters to enjoy their sport by providing them with the very finest in equipment and service