The self-locking shutter is a normally aluminum shutter that consists of two types of slats (main and intermediate), which alternate forming a compact unit. The particularity of this type of blade is that it rotates and self-locks when someone tries to force the blind from the outside, preventing it from going up by much force that was used. In fact, when trying to raise the blind from the outside, an accordion effect is produced that causes each of the slats to block each other. Therefore, the more you push, the more the blind will be blocked.
