Practice. No need to drill. By placing a fastening adhesive on the edges of the window and the other side is velcro. I can even close my window with the screen so it's fine. We set the screen that is 2 parts by pressing the scratch we stuck to the window. With the wind must allow sufficient flap between the two panels if there daily. Disadvantage as any screen: takes light like a curtain. Do not do it if we want to remove it and return regularly. In addition to strength it will get scratched quickly. I think this is a product that has become damaged over time but handy when the beautiful days will be there.
