Doors are statistically the number one target for forced entry. Many commercial doors are aluminum and often dual doors, meeting in the middle. Full length interlocking astragals provide far superior protection against break-ins than small single astragal plates or latch guards. The full length Astragals are more protection than only knob and deadbolt area of the door. Interlocking systems make prying the door open very difficult. And the full height length protects the entire door.