Fixed grilles: these are the most commonly used. They are either fixed to the walls of the window opening or attached to the facade. Their installation requires construction work. The big problem with installing these grilles is that they disable the use of the window, since they cannot be easily removed. However, they are the most secure against burglary. In addition, decorative shapes can be decoratively created on the grille.
Embedded grilles: They’re integrates in the façade but, instead of building work to insert the grille, security screws are use to adjust it. It is another of the safest types to prevent theft.
Extendable or sliding grilles: Is the mainly used in doors with frequent passage, but can also be set in windows. One of their advantages is that they do not block the window because they can be sideways opened. These types of grilles are easy to install; theyre only bolted to the facade. Them also have a security lock. They can also be painted in various colors (white, black, gray, etc.).