Eagle's 4th Generation H-Beam rods are forged from ASME certified 4340 steel in a two-piece forging and feature a fully machined and shot-peened surface. Eagle's 4th Generation design features thicker beam webbing for increased power handling capabilities, Increased beam and cap contact area and shoulder area to inprove bore stability under high load, and new small end profile to reduce reciprocating weight. Sizing is held to exact tolerances. Sold as a weight-matched set. Equipped with ARP 2000 bolts. Recommended for competition use.