A new meaning to the phrase "Door Security". Peace of mind and security for your facilities and for your employees. Keep out unwanted persons, birds, and rodents. Allow ventilation without compromising security. Industrial strength stainless steel. The Expanded Metal Overhead Security Screen Door will help you comply with your safety, quality control, and Homeland Security programs. Use with your existing overhead loading dock door or stand alone. If insect control is also needed, add .011" 30 x 30 mesh security screen.