Carbon Express PileDriver Fletched Carbon Crossbolt with 4-Inch Vanes, 6-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, 6 per pack, includes 100-grain field point, inserted moon nocks, plus 6 universal flat 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.