Monolayer railing Security in Window.One-piece security gate in a window. Installation of a one-piece Viometaloumin security gate with double steel blades between the glass window and shutter in a one-family house in the town of Aigio. The owner chose to put the type T-90, between the opening glass window and the shutter opening, so as to be able to sleep peacefully with the windows open during the summer months, when he visits his summer home.