External dimensions (L x W x H): 23.5 x 27 x 5.5 cm Interior dimensions (L x W x H): 19.5 x 18 x 5.5 cm Suitable for cats weighing up to 8 kg and with a waist circumference of up to 60 cm. Note: 1). Make sure the pet's width and height (shoulder height) is smaller than the screen door, thank you. 2) The magnet at the bottom of the door frame is used to align the door cover after moving, it cannot be used as a lock, thank you. Product improvements: 1. Convenient push button, you can easily control the entry or exit options of your cat or other cats, enter, enter, enter and exit, fully locked. 2. The fixing slot with the press stud of the weatherproof brush strip greatly helps to fix it. 3. Tunnel depth can be reduced, plus 1 pack of long screws + 1 pack of short screws, double-sided adhesive, to meet your needs, installed on various types of interior doors, exterior doors, walls, windows, cabinets, glass, etc. .