Features: 1.Hidden: Arched cat door is a safe haven for cats and kittens. One can have a hidden space to keep their litter box and food with the door closed. 2.Odor Barrier: Interior cat door chases away cat and dog poop odors in the cutest way when closed. Keeps the air in your home fresh at all times. 3.Easy DIY Installation: No flap cat door unlike most thin taped up cat doors, cat doors have sturdy screws for more security and easy installation. Suitable for solid and hollow doors. 4.Flapless: Kitten doors are not like cat doors with flaps that can hurt your pet, this cat door inner door is safe for cat and kitten paws and will never get stuck under the lid again. 5.Application: Interior cat door outer size is 28x24x6.5cm / 11.0x9.4x2.6in, inner size is 24x18cm / 9.4x7.1in, suitable for small and medium sized dogs, cat wooden doors, iron doors, walls, can open the hole can be installed. Specification: Item Type: Arched Cat Door Material: ABS Outer Size: Approx. 28x24x6.5cm / 11.0x9.4x2.6in Inner Size: Approx. 24x18cm / 9.4x7.1in PackageList: 1 x Cat Door 10 x Screws 6 x Nut 1 x English Manual Note Manual measurement, please allow slight error.