Made of ABS plastic, durable, resistant to scratching your cat / small dog. Also, easy to clean and can use for a long time 4 locking modes: open, closed, entry only or exit only, which allows your cat to enter and exit as he pleases without you losing control of his comings and goings This Magnetic pet door is suitable for Windows, glass doors, brick walls, PVC, uPVC and metal doors With this cat flap you can control the comings and goings of your pet and free up your time to open the door without worrying about your pet. At the same time that your pet will love a big and free house Prevents unwanted animals from entering your home How to install To find a door and draw a square according to the size of the flap To drill 4 holes in all four corners with a power saw 3To cut the square, and insert the cat flap into the hole (If the tunnel is thicker than your door, you can cut it as you need) To screw on the cat flap with a screwdriver.