ARP Pro Series connecting rod bolts are precision CNC-machined to exacting specifications and designed for optimum reliability. They are heat-treated and threads are rolled to provide up to ten times more fatigue strength. This makes them far superior to standard OEM fasteners in terms of durability, and fully capable of handling the extra stress of high-combustion engines.Connecting Rod Bolts, Pro Series, 2000 Alloy, General Rod Bolt Replacement, PairFeatures:Connecting Rod Manufacturer: General replacementCap Retention Style: Cap screwRod Bolt Head Style: ERod Bolt Nut Style: 12-pointFastener Yield Strength (psi): 200,000 psi Connecting Rod Bolt Diameter: 3/8 in. Connecting Rod Bolt Material: ARP2000 alloy Underhead Length (in): 1.600 in. Nuts Included: No Quantity: Sold as a pair