They work like balcony doors. It has properties such as extra locking and controlled from both sides. Having arms in both inside and outside, types such as ratchet, key or barrel locking mechanisms are available. Different threshold applications and very different arm applications can be made. Trouble causing risks increase with larger widths.
Window Pattern Options
Cedar
Golden Oak
Oak
Mahogany
Grey
Anthracite
Smooth Anthracite
Anteak
Trompet
Dark Oak
Eiche Rustical
Silver D (Silver Grey)
Ash