Rain-X RX5079309 Heavy Duty Wiper Blade 18" Rain-X introduces a heavy-duty windshield wiper blade for heavy-duty class 3 to 8 vehicles. Wiper blade made with a synthetic squeegee to withstand the elements and provide a smooth wipe Galvanized steel frame provides long-lasting durability and protection against corrosion Fit 96% of the medium- and heavy-duty truck market