Excalibur Beacon V-Nock, 3 Pack. The Beacon V-Nock can be used with any Excalibur crossbow that uses a V-Nock, or anywhere a moon nock is required. Activates an ultra-bright red light at the shot to track arrow flight and aid recovery. An exclusive easy-off deactivation switch makes reset fast and simple between shots. Compatible with Hybrid X models. Fits all carbon arrows with a .300 inch inside diameter.