Use this MD Building Products 3 ft. x 1-3/4 in. x 1-5/8 in. Vinyl Door-Bottom Moulding with a smooth-top threshold. Equipped with both slotted screw holes and screws for easy adjusting, it protects your doorway from drafts, moisture and insects by sealing the gap between the threshold and the bottom of the door. The threshold's white vinyl construction is durable.