This is ONE replacement connecting rod bolt, that fits all IE connecting rods which use a 3/8" Rod bolt size. This is a high quality bolt made by ARP from ARP2000 Alloy. These are an upgrade from the common 8740 Alloy bolts however they are standard equipment with all IE rods. These feature tensile strengths in the 220000 psi range, and very good consistency. They feature high quality threads which are rolled after heat treat for highest fatigue resistance.