Do not rush to choose a metal door. First figure out what it is. And it is two steel sheets interconnected by means of a steel rolling frame. Vertical and horizontal stiffness ribs are installed in the space between the sheets of the door, giving the doors even greater strength. In addition, castle and cross -country mechanisms are also installed inside the door, which are the basis of the door protection system. The rest of the door space is filled with heat -insulating material. The door of the door is also made of steel. It has additional means of hacking. Such means are metal pins with which the box is attached in the doorway.
