The Last Chance Archery Vane Master Pro Crossbow Fletching Adapter is perfect for fletching any crossbow bolt types. It doesn't matter if you're using a flat nock, half-moon nock, Omni nock or no nock at all. This unique design allows the adapter to spread apart, then compress back together using spring-loaded tension, to hold tight onto any and every crossbow bolt. It can also function on many different fletching jig types. This new adapter has an internal alignment pin to ensure the arrow sets straight inside the adapter while in use.FeaturesPerfect for fletching crossbow boltsUnique designFunctions on different jig types