Features: Our interior Dog door can be installed quickly and easily, perfect for pet owners who want convenience. Provide more security for pet and pet owners. Rubber flap. Strong, weatherproof, weather resistant. Four Screw holes at the top of the Flap for adjustment, and it also can be use as cats door flap replacement. Install effortlessly on wooden/glass patio doors or interior partitions, creating a climate controlled pathway for pets during rainy season or cold winter days. Specifications: Component: Rubber Size M: Approx. 26x43cm/10.24x16.93' Size L: Approx. 30.5x32.2cm/12.01x12.68' Quantity: 1pc Package Includes: 1x Replacement Dog Door Flap note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.