Ignitor lighted nocks are shot activated, fully index able, require no tools to turn off, always light, and are 100% waterproof. Each pack provides precision inserts for h diameter arrows. No adapters needed, select and install the Swiss turned insert for your shaft, place the LED battery light into the nock and press-fit the self centering nock for unmatched accuracy. LED battery light replacement takes seconds. Ignitor nocks are backed with an unconditional lifetime warranty covering aluminum inserts and nocks under any condition.