When hunting in low light conditions, it can be difficult to follow the path of your arrow. Burt Coyote solves that problem with the Lumenok, the brightest and easiest to use lighted nocks on the market. The Lumenok activates when your arrow is released, and stays on until you turn it off. Signature Series Lumenoks work with any aluminum or carbon arrow that uses standard ICS components. Fits: Aluminum or carbon shafts with internal diameter of .245 including PSE Carbon Force radial X, Easton Lightspeed, Powerflight, Fatboy, XX75, XX78, Eclipse and Cobalt. Carbon Express Terminator, Maxima, CX Hunter, and Heritage. Carbon Impact Fat Shaft. Victory Arrows V-force and X-ringer.