Weldoor Door Sweep,Energy loss through the bottom of doors can be minimized with the installation of a door bottom in conjunction with your smooth top threshold. This combination provides a weatherproof seal between the bottom of the door and the top of the threshold. Improve the energy efficiency of your home U-shaped door bottom - Fits 1-3/4 in. door Easy to install Vinyl finned insert Mill/vinyl finish for added durability Helps to provide a weatherproof seal