All Eyewall Armor® Accordion Shutters have been designed with a patented offset screw boss that isolates the assembly screw from the hinging of the shutter blades which minimizes “hinge corrosion” which is the most common failure mode of all other accordions. The assembly screws can be easily lubricated, ensuring continuous and reliable operation and protection when you need it most. Eyewall Armor® Accordion Shutters offer the easiest and fastest one-step locking procedure in the industry. No additional locking rods or devices are required. They are also the tightest-stacking shutters on the market today and are virtually undetectable on your home.