The M-D Vinyl L-Shape Screw-on Under Door Seal features a vinyl bulb and fins 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. Because of the L-Shape design, the Under Door Seal is not visible on the exterior of the door and it fits all door thicknesses. 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.