AAE Bitz Nock Receiver 1005542. 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. Specifications for AAE Bitz Nock Receiver 1005542: Manufacturer: AAE Color: Black Features of AAE Bitz Nock Receiver: Precision vane spacing for crossbows compatible with Bitzenburger fletching jig Offers 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 nocks Features a set screw for single vane repair alignment Direct OEM knob replacement Not compatible with Ravin crossbow nocks (requires Bitz Knob Standard 3-4) Package Contents: AAE Bitz Nock Receiver