The M-D Vinyl Concealed Screw/Nail-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. This seal is less visible than most under door seals and is ideal for a more concealed look. This seal is often used to replace Under Door Seals on pre-hung doors. Requires removal of the door in order to screw or nail to the bottom of the door. All of the hardware needed to install is included. Before installation, cut to desired length using a hacksaw.