TenPoint HEA-358.3, Alpha-Brite Lighted Nock System, 3 Pack SKU: HEA-358.3 Description: The three-piece, Alpha-Brite Lighted Nock System begins with a Nock-Receiver insert with a six-sided interior cavity designed to accept a combined LED unit and translucent pegged Alpha-Brite Nock. The Nock Receiver is glued into the nock-end of the arrow and indexed with the vanes. Includes: translucent Alpha-Nocks LED Units Nock Receivers (for arrows with shaft sizes .297, .300, .305 I.D) A Nock Receiver Alignment tool