Hautstore 4 Way Cat Flap Cat Flap with Tunnel Hide Cutout Cat Flap Dog Cat Door with Lock Cat Flaps for Small Animals Cat Mate Lockable Easy to Install White (L)Inner frame dimension: 19*18CM; 4 locking mode: open, close, single entry or single exit; Made of ABS plastic, sturdy and durable;Outer size: Height: 25CM Width: 23.5CM Thickness: 5.5CM, Inner size: height: 19CM Width 18CM.Made of ABS plastic, durable, scratch resistant from 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 come and go as they please without you losing control of their comings and goingsThis Magnetic Pet Door is suitable for Windows, Glass Doors, Brick Walls, PVC, uPVC and Metal DoorsWith this cat flap you can control your pet's comings and goings and free up your time to open the door without worrying about your pet. At the same time your pet will love a big and free housePrevents unwanted animals from entering your home.+ productAttention :1.Some customers think the door will be stuck and never fall down. Because of the low temperature which influences the function of the cat flap. Please drip a drop of antifreeze engine oil which can solve this problem. Don't worry about this problem with the cat flap.2. You must keep the glass door nearby before using the switches to change the model.3. Please measure your pet's width before purchasing.Size L:Outer size:25*24*5.5CMInner size: 19CM*18CMWeight: 0.52 kgSuggested weight: Weight 16KGWaist circumference 60cm4 Locking Positions can be chosen1) Entrance (possible entrances)2) Exit (possible exits)3) Fully open (entry and exit possible)4)Closed (entry and exit impossible)How to install1.To find a door and draw a square according to the size of the flap2.To drill 4 holes in the four corners with an electric saw3. To cut the square, and insert the cat flap into the hole (If the tunnel is thicker than your door, you can cut it according to your needs)4.To screw the cat flap with a screwdriver.FeaturesThe package includes:1* cat flap (external dimension: 18*19CM)4* screws1 * User Manual