Prepare your semi truck to be Ready for the Road Ahead , with the Truck-Lite 30 Series Round Open Back PVC Grommet that provides improved wire, cable, and hose protection. To prevent wires from being shredded, cut, or damaged, this replacement ring neatly fits around the rim of a hole. Fashioned with an easy-to-install design that doesn't require any specialized tools. FleetPride is your First Click in Heavy Duty .