If you are over 750 rear wheel horsepower in your Cummins, the cylinder pressures dictate that you step up to a set of Hamilton ExtremeDuty Push Rods. These pushrods are a 3 piece design that features 12mm diameter .120″ wall, which is much thicker than the OEM 3/8 or other performance shops 7/16″ Diameter. Sold as a complete set.