TenPoint Alpha-Brite Lighted Crossbow Nock - Red - 3 Pack - The three-piece, Alpha-Brite Lighted Nocks for Crossbow Bolts System begins with a nock-receiver insert designed to accept a combined LED unit and translucent pegged Alpha-Brite Lighted Crossbow Nocks. The nock receiver is glued into the nock-end of the arrow and indexed with the vanes. Crossbow bolts and nocks for use with all TenPoint, Horton Crossbow Innovations, and Wicked Ridge crossbows. Use of the Alpha-Nock in any of these crossbows will not void the warranty, even if your crossbow originally required the use of a flat nock or Omni-Nock.