Best Cat Flap Pet Door "Comfy" Interior Garage Door Lockable Stopper Indoor In Wall Hole Pets Doors Easy Installation Opening One - Four Ways - Cat Stop Large Reviews - Ideal For Small Dogs and Cats - Bonus Inside, 100% Guarantee - Europe Brand Bonus Inside 1 year 100% Guarantee 4 way Locking Cat Flap Door Brush Lined Edge Recommended for thin doors and screens up to 1/2-inch thick