Prepare your semi truck to be Ready for the Road Ahead , with the Truck-Lite 2.54" 10 Series Round 1-Incandescent Marker / Clearance Light that supplies reliable safety lighting. With a strong output, this replacement light enhances vehicle safety in all types of climates and conditions by providing high visibility. Fashioned with a durable polycarbonate lens for increased heat and impact resistance. FleetPride is your First Click in Heavy Duty .