The TenPoint Evo-X Centerpunch is the most accurate crossbow arrow ever, the CenterPunch 16" crossbow bolt is fletched slightly offset and is fitted with an 84-grain insert and TenPoint's Alpha-Blaze lighted nock. The Alpha-Blaze lighted nock contains a one-piece nock/LED unit that is indexed with the vanes and press fits into the arrow's aluminum Bushing. Upon firing the crossbow, the bowstring's force compresses the two pieces and activates the lighted nock. Deactivate the easy on/off Alpha-Blaze lighted nock by pulling the nock straight out until the light turns off, no tools required. The LED light of the Alpha-Blaze system lasts for approximately eight hours when activated. FeaturesMost accurate crossbow arrow everLazer-tech carbon weave wrapSlightly offset fletchingsOne-piece nock/LED unitNo tools requiredTenPoint Alpha-Nock HP equipped with HP aluminum bushingLED nock lasts approximately 8 hours Inside diameter .297"17.5% F.O.CNote: Vane colors may...