Xcluder® Automatic Door Bottom Rodent Proof, Auto-retracting Door Bottom Seals Ideal for uneven surfaces. The Xcluder Automatic Door Bottom (ADB) features an aluminum case surrounding a movable drop-bar seal. The drop-bar seal is actuated by a plunger which contacts the jamb as the door is closing, forcing the drop-bar seal down against the floor / threshold creating a secure seal. The rubber seal is filled with our patented Xcluder fill fabric to provide dependable protection against rodents and the elements. Key Features: Surface mount to either wood or hollow metal doors Non-handed reversible design. Simply flip the ADB for left or right hand actuation Available in lengths from 24" (61 cm) to 48" (122 cm) lengths Xcluder ADBs can be trimmed down by a maximum of 2" (5 cm) End plates included The drop-bar seal actuation mechanism causes the drop-bar seal to always actuate on the hinge side first. This feature prevents the seal from skidding along the floor / threshold while the door is being closed. Door hang up will not occur. Seals gaps up to .75" (20 mm)