When nothing but the best will do for the bottom of your doors. Our Automatic Door Bottoms (ADB) are made from extruded aluminum combined with closed cell sponge neoprene, felt or brush and is activated when a plunger depresses against the door stop or jamb, sealing out draft, sound and light. Surface or mortise types available in stock sizes 24", 30", 36", 42" and 48". These can be shortened up to 6" (from lock side) on job site - 24" can be shortened 3" only. Reversible for right or left hand installations. Maximum drop is 5/8" and they are available in bronze anodized.