Designed to support the primary tension load caused by each rotation of the crankshaftConstructed from seamless and defect-free 8740 chrome moly steelHeat-treated before grindingCome with a large under-head radius for greater strengthFacilitates easy installationARP High Performance Connecting Rod Bolt Kit is designed to support the primary tension load caused by each rotation of the crankshaft. It is constructed from seamless, defect-free 8740 chrome moly steel that is heat-treated before grinding and thread rolling. This rod bolt comes with a large under-head radius for greater strength and facilitates easy installation.