4 WAY LOCK MODEL - Two button lock can provide 4 modes: IN, OUT, IN / OUT, LOCKED. Easy to control your pets inside and outside. After installing this door to cat, you no longer need to close and open your door all the time while waiting for your pets. DOUBLE MATERIALS - All cat flaps are made of durable ABS plastic, which is weather resistant while being perfect for comfort and ease of use. Rugged 100% UV resistant polycarbonate construction ensures a virtually unbreakable cat door. The surface is also easy to clean. 4 Way Locking Pet Flap With Magnetic Closure - Hole Size: 6.7 ’’ x 6.3 ’’ (Detailed size may refer to the picture). The diameter of the cat door is approximately 11.8 inches. Suitable for all kinds of cats and small dogs (6 kg (13 lbs)). EASY INSTALLATION - Whole cat flap sets include nails and mats so you can easily install it in windows, doors, cabinets. Applicable Doors and Windows - Suitable for glass doors and windows, wood doors, PVC or metal doors and brick walls.