The Ten Point Alpha-Blaze HPX Lighted Crossbow Nock is a must-have accessory for any serious crossbow hunter. This innovative nock features a one-piece design with an integrated LED unit, eliminating the need for assembly. Its unmatched durability ensures it can withstand the rigors of frequent use. The Alpha-Blaze HPX is specifically designed for use with TenPoint rail-less crossbows, including the TRX 515 and TX 440 models. With its ability to provide superior arrow flight visibility, this nock is essential for any serious hunter. Plus, it's on sale now, making it an affordable option for those looking to upgrade their gear. And with fast shipping, you can get your hands on this essential accessory in no time.Product Features and Specifications: Nock Type: One-piece HPX Nock / LED unit Battery Life: 24-hour approximate Activation Method: Bowstring activated Retention Groove: Yes, allows user to feel positive engagement Speed Approval: 515+ FPS approved Required for: TenPoint rail-less crossbows (TRX 515 and TX 440)