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.