Features: 1.The barrier?free design of the pet door allows pets to easily enter and exit the room without assistance. 2.The cute cat?ear shaped cat door prevents cats from scratching the door anxiously when no one is at home and cannot enter the room. 3.The cat door is suitable for household doors of any size, and can be tailored according to the thickness of the door. 4.Use screws to install, avoid falling off and gaps caused by tape installation, and no noise when the cat crosses. 5.The cat door is made of ABS material, wear?resistant and durable. The edges are burr?free to protect the cat from scratches. Specification: Item Type: Cat Door Material: ABS Size: Approx. 22.5 x 26.5 x 5.5cm/8.9 x 10.4 x 2.2in(Length x Width x Thickness) Total Width: Approx. 5.5cm/2.2in Inner Length: Approx. 17.5cm/6.9in Inner Tank Thickness: Approx. 3.5cm/1.4in PackageList: 1 x Cat Door 8 x Screw 8 x Nut 1 x English Manual Note 1. Please allow error of 1?2cm due to manual measurement. 2. The screws are uniformly distributed by the factory. Because the thickness of each door is different, if the screws are not suitable during installation, users need to buy other screws themselves.