The ESCO Bearing Cup Installer - Bolt Retained for Spicer 1610 - 1880 Series Heavy Duty Bearings (MODEL 40313) is designed to be used for the installation of bearing cups on bolt-retained universal joints that are commonly found on class 6-8 transportation trucks and equipment. The tool will automatically align bearing cups during installation, reducing damage to needle bearings in the process and decreasing service time. This model fits the driveline for Spicer 1610 to 1880 series and most other heavy-duty truck and machine type u-joints that have bolt-retained bearing cups.