Since use most often some sizes of windows and doors the design of private homes it has done for several models of windows and doors with these dimensions and now when you create a visualization of the project of the next house I do not have anew each time to model the doors and windows. I simply insert this small but very useful collection. Not only that they are light so also they can be used in the interior the same homes as the layout of the windows have been made on both sides have hinges and