The Autotex 72 Series 18" Narrow Saddle Flex Front Wiper Blade is designed to fit 5mm and 6mm narrow saddle wiper arms. It features a super duty steel frame for maximum durability in the most extreme weather conditions. The flexible design of the blade ensures a smooth, streak-free wipe every time. With its superior construction and reliable performance, the wiper blade is the perfect solution for old model school bus and RV applications. FleetPride is your First Click in Heavy Duty®.