I came across IndowWindows on Instagram and thought it might finally be a solution to my 1950 single pane, grid glass window wall. I had to measure each of the 12 squares in the window wall since the window was made by hand. Each window was a tiny bit different so I didn't know how this would work out. I am so happy to report that the inserts work and look great! In fact they make the window look more beautiful. Before using the inserts you'd have to wear a scarf when you sat next to the window...now there's no cold breeze or draft. Also the product is very well made and they were packaged nicely. The individual labels will definitely make reinstalling them very easy.