Carbon Express PileDriver 20-Inch Fletched Carbon Crossbolt with 4-Inch Vanes & Lighted Moon Nocks, 3-Pack BONE-CRUSHING PENETRATION - Heavy grain weight creates maximum kinetic energy and greater knock-down power ADVANCED CONSTRUCTION - Ensures spine consistency for greater accuracy. The composite material is extremely durable at impact for exceptional reliability and repeat performance. REAL STRAIGHTNESS - Precision sorted for straightness to +/- 0.004", for repeat maximum consistency SPECIFICATIONS: Fletched with 4" vanes, 20" size, 442 grains, 0.348" Diameter, 3 per pack, includes 100-grain field point, inserted moon nocks,3 universal flat nocks, plus 3 red lighted nocks CONFIDENCE IS KEY - Designed for the hunter who wants ultimate penetration, the PileDriver Crossbolt instills supreme confidence when tracking even the largest of prey.