New, brighter design allows you to track your bolts in flight and make them easier to find after sunset or in lowlight conditions. Batteries are easily replaced and the nock stays lit for hours. The carbon flat nock weighs 29 grams. Flat nock fits .297" inside shaft diameter. Compatible with Horton HP Carbon bolts, Easton Powerbolts, Ten Point Carbon bolts, Beman Thunderbolts and Cabela s Stalker X Bolts. Per 3.