This CRL Triple Fin Vinyl Door Sweep is designed to prevent dust, moisture and wind from entering between the base of the door and the threshold. The triple fin design gives added protection against drafts and moisture. Supplied with screw for easy installation. It is sized for a three-foot (0.9 meter) opening with an overall size of 36-1/2 inches (92.7 centimeters). It is supplied with screws for easy installation.