Check the listing for details. NEW NOCKTURNAL LAUNCHPAD UNIVERSAL LIGHTED CROSSBOW ARCHERY NOCK, 3 PACK, KNOCK. Condition: New. Listed at 36.99 USD. NEW NOCKTURNAL LAUNCHPAD UNIVERSAL LIGHTED CROSSBOW NOCK, 3 PACKFeatures:Durable & Long-Lasting Integrated, one-piece aluminum housing protects battery and LED during high-speed flight and impact.Custom-Fit Micro-Adjustability, adjustable barrel end is easy to install and provides a reliable performance fit.One Size Fits nearly all crossbolt brands and models (comes with 2nd Grey Collet).Includes reusable c-clip to prevent lighting during storage.Easy & Reliable On/Off Indexed nock end provides added safety and an easy ON/OFF design.Available in Red or GreenEach nock in this package weighs approximately 30 grains3 per packageThe Nockturnal Launchpad Crossbow Nock is easy to install, easy to use, and specifically engineered to light up every shot with high-visibility LEDs. The lightweight, durable design is fully adjustable and can provide a custom precision fit on virtually any brand of crossbow bolts.