Lumenok Easton Carbon Crescent Bolt End (3-Pack), Green Ecc easton carbon crescent - for easton carbon bolts 297 inch on the ID The lumenok is a green lighted arrow nock used for shot placement recongition & arrow retrieval Now equipped with a easily replaceable battery For use in Horton, Barnett, Darton, PSE and Bowtech crossbows and any other crossbow designed to use a crescent or moon nock. Fits .297" ID shafts Green crescent end Easily replaceable battery 40 hours "on" time, 4 year shelf life