This screen pet door made of quality ABS material, durable and sturdy. Hanging hinge easy to swings both ways freely last for a long time, Magnet slows the door down and stops it in place after 3-5 times sway. Our dog screen door Inner Size 11" x 13"/28*33CM, Outer Frame 13.4" x 17.3"/34*44CM, for most pets like dogs, adult cats, rabbits, pet pigs, but not recommended especially little pets because this door is too big. This dog door for existing screen door, porch, window or other screen areas, but can not be used for thick, wooden, iron/aluminum doors, walls. It does not come with the screen insert, you need to place the cutting-out existing door screen between the door flap when installing. Use the flat-head screwdriver to separate doggie door so you have 6 parts(frames, flaps, locks). You can lock the door to stop pets go in and out, double-sided lockable. Fixed 2 screws on door flaps, 4 screws to hold the outer frame top or bottom to keep the door from separating and falling, easy to install, comes with installation instructions.