When it comes to protecting your home, the security door you choose makes a big difference. At Allied Iron, we offer both Standard Security Doors and Regal Security Doors, each designed to provide strength, durability, and visual appeal. The difference comes down to the door’s construction, frame, and overall design possibilities. Door Shell Size & Structure The Standard Security Door is built with a 1” x 2” door shell , offering solid protection and a classic structure. In