4 Way Lock Model - Two button lock can provide 4 modes: IN, OUT, IN / OUT, LOCKED. Allows you to easily control your pets. After installing this cat flap you no longer need to close and open your door all the time and wait for your pets. Durable Materials: The entire cat flap is made of durable ABS plastic, is weather resistant and is perfect for comfort and ease of use. The sturdy UV resistant polycarbonate construction ensures a virtually unbreakable door. The surface is also easy to clean. 4-Way Locking Cat Flap with Magnetic Closure - Inner Size: 18.5 x 20.5cm. The diameter of the cat door is approximately 30cm. Suitable for all types of cats and small dogs (6 kg). Easy Installation - Cat flap kits include nails and mats, so you can easily install them in windows, doors, and cabinets. Door frame designed with brush reduces noise. Applicable doors and windows: suitable for glass windows and doors, wooden doors, PVC or metal doors and brick walls (warning: the thickness of the door should be less than 2.5cm).