Crescent or Moon Shaped Nock .287" ID These nocks fit Easton FMJ brossbow bolts These nocks will not fit Carbon Express Bolts Now equipped with an easily replaceable battery (Part No. RBS). The Lumenok lighted crossbow bolt end offers the crossbow user the ability to see shot placement like never before. The Ultra bright LED technology used in this Lumenok bolt end offers unmatched visibility by other brands. Add a new dimension to your next crossbow hunt, and take your bolt home with you.