Lumenok Crossbow Bolt 20 in. Red R300 Nock 3 pk. 20" Lumen-Arrow Bolt ends, 3-pack;Equipped with R300 nock and replaceable batteries;Designed for rail-free style crossbows like Ravin models;Snap-Loc technology for secure string attachment;92-grain brass insert for true weight forward performance;Durable construction for repeated shooting;Cork battery stop preinstalled on all bolts to prevent dislodgement;Available in Standard (+0r - .002?) straightness;Compatible with Ravin R9, R10, R15, R18, R26X, and R29X crossbows (Not meant for use in R500)