Magnador 13 in. x 19 3/4 in. Durable and Simple. The MagnadorTM Two-Way Pet Door is a simple to install product at a value price Integrated locking knobs eliminate misplaced or damaged sliding panels or covers. Durable High Impact Polystyrene resists chewing and is tough, yet forgiving for hard headed dogs. Used extensively in a variety of situations: kennels, doors, screen doors, metal buildings, more Close fit between swinging panel and frame keeps out unwanted pests and bugs.