Carbon Express products are engineered with innovation, precision, and performance to fulfill its promise of allowing you to “Shoot Better.” The PileDriver crossbolts are made for the hunter that wants the ultimate bone crushing penetration. This is a heavier carbon bolt to create maximum kinetic energy and greater knock down power. Its advanced construction ensures spine consistency for greater accuracy, and the composite material is extremely durable at impact for exceptional reliability and performance. Every 6 pack of bolts comes with inserted moon nocks and an additional 6 universal flat nocks. Each bolt is precision sorted for straightness to ensure shot after shot consistency (straightness: +/- 0.004")