Get your semi truck Ready for the Road Ahead with improved drivetrain capabilities, with the Neapco 4.51" x 7.79" Rubber 8-Apex Driveshaft Boot. Thanks to its ability to shield the constant velocity joint, this replacement piece is the ideal option to block dirt, oil, and contaminants from causing damage. Fashioned with ultra-durable materials to provide long-term reliability. FleetPride is your First Click in Heavy Duty .