The AAE Bitz Crossbow Nock Receiver is designed as a direct replacement for the original OEM knob. The knob boasts two vane spacing options, facilitating consistent setups for 3-vane (120-degree) and 4-vane (90-degree) configurations. It's engineered to align and retain most crossbow bolt/arrow moon drivers and nocks, ensuring the most consistent and repeatable fletching. Additionally, the knob includes a set screw for single vane repair alignment, allowing for adjustments without the need to rotate the nock. FeaturesPrecision vane spacing for crossbows, compatible with Bitzenburger fletching jigOffers two vane spacing options: 3-vane (120 degrees) and 4-vane (90 degrees)Designed to align and retain most modern crossbow bolt/arrow moon drivers and nocksFeatures a set screw for single vane repair alignmentDirect OEM knob replacementNot compatible with Ravin crossbow nocks (requires Bitz Knob Standard 3-4)Available in 3 & 4 Fletch, Crossbow