TenPoint Alpha Brite Lighted Nock System 3 pk.TenPoint Alpha Brite Lighted Nock System 3 pk. The Nock Receiver is glued into the nock end of the arrow and indexed with the vanes; Six sided interior cavity designed to accept a combined LED unit and translucent pegged Alpha Brite Nock; Package includes translucent Alpha Nocks, LED Units, Nock Receivers (for arrows with shaft sizes . 297, . 300, . 305 I. D), a Nock Receiver and Alignment tool, and a refletching tool Item Category Code: 3400 Product