Check the listing for details. Nockturnal Xbow Lighted Nocks Universal Fit. Condition: New. Listed at 29.60 USD. Nockturnal Launchpad Universal Crossbow NockFeatures: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. The 30 day period is NOT a trial period! Money back returns are ONLY accepted on UNUSED AND UNOPENED product, The Product is subject to inspection to determine if product has been opened and/or used. Buyers may be subject to a fee for products returned in used / opened condition.