Our spring-activated Automatic Weather Seal Door Sweeps lift when the door opens to clear carpets and lower when the door is closed to seal the gap between the door and threshold. These door sweeps feature a medium-duty extruded aluminum carrier with a pliable single sealing fin and slotted screw holes to make adjustment and installation easy. These door sweeps also seal gaps up to 0.50" between the threshold and door bottom and come individually packaged with installation instructions and Phillips-head screws.