The nock serves to keep the arrow in place on the string as the bow is being drawn. Our Nock are made from hard ABS plastic and is made to fit the 20 inch Aluminum Crossbow Arrows. It features a half moon style which curves perfectly on your crossbow string.
It Fits Perfectly On The Following Arrows:
Survival Arrow Equipment Tactical Black 20 Inch
Extra Aluminum Survival Arrow Red 20 Inch 6pcs Set
Overall Length: 0.73 inch
Thickness: 1.92 mm