Feature:DEEPOWER Lighted Nocks for arrow .204&233&244&246 with external ON/OFF switch is easy to install, easy to use. Only slide the switch and the nock turns off. Bowstring activated, shinny light for more than 24 hours helps you to find the arrows no matter in day or night.DEEPOWER archery arrows LED Nocks with bushings, fit for both .204 & .233..