The combination of galvanized side rails and varnished wood ends deliver a sturdy long lasting product The combination of galvanized side rails and varnished wood ends deliver a sturdy long lasting product Comes in 10 inch, 15 inch and 18 inch height and is expandable from 25 - 45 inches in wide Bright mesh screen allows for relaxing air circulation. Save money on air condition costs with the use of our adjustable mesh screen and turning off the air condition during the open window seasons WARNING: Screen will NOT stop child from falling out of window. Keep child away from window The Home Intuition Expanding Window Screens is durable, lightweight, and super easy to install. Made from galvanized metal rails and varnished wood ends to ensure a longer lasting product. With no tools required place the mesh screen in the preferred window and expand until secure. To ensure a tight seal add a strip of weatherproof strip to the top and bottom giving you a tight seal on any uneven edges and finally close the window. Installation made simple. Save money by turning off the air conditioner and allow fresh air and gentle breezes.. Adjustable screen works best with vertical sliding windows. The fastest and quickest solution to permanent installed screens that cost a fortune to buy, measure and install.