Safe and Durable: The indoor cat door is made of ABS material, which is wear-resistant and durable. The edges are smooth and burr-free to protect the cat from scratching. Smooth design, paintable materials, perfectly match your door and decor. Usage: Interior cat door is suitable for all hollow doors, solid doors and interior doors. Perfect for lary rooms, bedrooms, basements, etc. It will have its own activity space, and your home will smell fresh. Barrier-free design : There is no one in the house. Put the cat food in the house. With the indoor door cat door, there is no need to worry about the dog entering. The cat can go in and out freely to play, eat and drink Does not fall: the interior cat door is installed with screws, avoids falling and gaps caused by installing the tape, no noise and no problem caused by door locks and door damage External dimensions: 26.8 x 23 x 6.2 cm, opening: 17.5 x 3.5 cm, suitable for doors from 2 to 4.5cm thick. Friendly after-sales service : Please feel free to contact us if you need any help from us or any questions about the cat door, we will give you a satisfactory solution within 24 hours.