PRODUCT DESCRIPTION The M-D Vinyl U-Shape Screw-on Under Door Seal features vinyl 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. 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. FROM THE MANUFACTURER Durable vinyl door bottom has soft vinyl fins to seal against top of threshold and sill. Great for steel doors.