Switch Nocks are simple to use, highly durable and easy to see. Simply insert the nock into your arrow shaft, snap the nock until the second click and let the lighted nock do the rest. Upon release of the arrow, your bowstring will activate the LED by pushing on the LED at the bottom of the nock's throat.
Fits most standard carbon shafts with an internal diameter of .245"- .246"
Fits most aluminum arrows utilizing super uni-bushing systems