The Roadworks Universal Anti-Sail Panels are designed to enhance the functionality of trailer flaps. Made from durable stainless steel, these 11-inch by 20-inch panels securely mount to frame rails, ensuring a reliable and long-lasting solution. With the included hardware, installation is hassle-free. These anti-sail panels effectively prevent flaps from lifting and flapping in high winds, reducing drag and improving fuel efficiency. Practical and easy to use, these panels are a must-have for any trailer owner looking to optimize performance and minimize maintenance.