WIPER BLADE FOR COMMERCIAL USE: This commercial windshield wiper blade is meant for tougher conditions and designed for heavier vehicles, such as Class 6-8 Trucks, Class A RV's and school or transit buses 9x4 HOOK DESIGN: Engineered for a secure and stable fit, ensuring superior contact with the windshield for streak-free visibility. EXTRA VISIBILITY FOR SAFETY: This windshield wiper blade replacement is made with heavy duty natural rubber for superior wiping performance and visibility AERODYNAMIC ASYMMETRICAL SPOILER: This technology provides downforce on the wiper blade to maintain constant windshield contact for advanced performace COMPATIBILITY: This heavy duty windshield wiper blade includes all necessary hardware for easy installation. It fits Hook (9x4) arms and comes with 3G-5+F9 adapter pre-installed. Review your manufacturer’s application data to ensure a proper fit.