The M-D Aluminum U-Shape Screw-on Under Door Seal features a vinyl seal for protection from drafts moisture dust and insects. Save on energy by sealing the bottom of the door and keeping the heat or air conditioning from escaping. Screw holes are oval shape to allow for easy adjustment to fully seal the gap at the bottom of the door. All of the hardware needed to install is included. Before installation cut to desired length using a hacksaw.