Product information Extra large cat door Specifications Note: External dimensions: 28 x 24.9 x 5.5 cm (W x H x D); Internal dimensions: 22 x 20 cm (width x height); Cutout dimensions: 24 x 21 cm (width x height); Suitable for cats up to 12.49 kg (the size below 60 cm); Material: ABS Plastic Color: White Style: Flap Weight: 0.5kg Please make sure the width and height (shoulder height) of the pet is less than the door of the pet umbrella, thank you. The depth of the door/wall/window you want to install is better than 5.5cm depth, so 8 screws can be easily screwed into both sides. More Information Package Includes CEESC Extra Large Cat Door: 1 Large Cat Flap 8 Screws 8 Screw Caps 1 Installation Instructions If the cat flap is too thick for the door, use scissors or a cutting machine to cut along the width line of the frame. Read more Installation instructions 1. Draw the outline on cardboard Draw the frame of the cat flap on cardboard and cut it out. Note: You need to prepare these