Check the listing for details. Bitzenburger Crossbow Nock Receiver #3020. Condition: New. Listed at 31.64 USD. Bitzenburger Fletching Jigs Crossbow Nock Receiver Nock receiver that accepts all 22/64 diameter crossbow bolts with most end caps and is indexed at 120 degrees for 3 fletch spacing. Mfg Number: 3020 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.