The M-D Aluminum and Vinyl Flex-O-Matic Screw-on Door Sweep features a spring-action vinyl seal for protection from drafts, moisture, dust and insects. The spring-action seal raises when the door is opened and lowers when the door is shut to allow the sweep to clear any flooring when the door is moving. Save on energy by sealing the bottom of the door and keeping the heat or air conditioning from escaping. All of the hardware needed to install is included. Before installation, cut to desired length by using a hacksaw.