An exclusive, patented design: Dedicated to the development and design of pets, if you want a separate entrance and exit for your pet to facilitate daily access, the NAMSAN pet gate doors are the perfect choice. Size: outer frame: 9.8 x 12.4 inches, inner door flap: 9.6 x 8.2 inches, made of high quality material, it is wear-resistant, temperature resistant and has a long service life. COMFORTABLE FOR DAILY LIFE: Ideal for balcony doors, so owners don't have to open the door again and again for their pets. Open a separate entrance / exit for pets and this does not affect the normal use of the fly screen door after installation, which also provides protection from mosquitoes and insects. Easy to use: magnets in the bottom of the frame, close automatically; the item is lightweight, and you do not need any effort for pets to open, and it is very easy to understand how to use; the locking locks on the left and right side of the door allow full locking of the door and control the access of the pet. Suggestions: pet flap is suitable for fly screen doors, windows and other fly screen areas; installation instructions for easy installation is included; inner flaps do not include grid, you need to install the cut out grille in the frame of the cat door.