And produced

Together, the frame and sheet are a rather formidable barrier, which is impossible to break out without the help of rather weighty devices.

Castles in steel doors are part of them, and are not at the same time. They are constructed, improved and produced completely separately from the doors, but in the issue of the reliability of the doors it is very important to choose the right locks. The door type matters: external doors, entrance doors, interior (although, it is unlikely that anyone wants to put iron interior doors), office doors. For each type of door, locks are selected by the corresponding type. They have many different protection mechanisms from hacking and choosing a key.