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 12x4 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 VERSATILE WINDSHIELD WIPER: This PEAK Transport wiper blade is the perfect replacement blade for any vehicle traversing difficult conditions requiring high quality windshield wiper performance COMPATIBILITY: This heavy duty windshield wiper blade includes all necessary hardware for easy installation. It fits Hook (12x4) arms and comes with F5 adapter pre-installed. Review your manufacturer’s application data to ensure a proper fit.