Durable material: Pet skin flap is made of high-quality ABS, weather-resistant, strong and durable 4-way lock: open, lock, only (cats can enter but can't go out), only (cats can get out but can't enter), check pets in and out Noise reduction: The dog flaps are designed with brush strips, which can reduce the noise of pets when they enter and exit the door. Beautiful decoration of glass doors and windows-perfect for installation on glass windows and sliding doors Suitable for cats and small dogs Specification: Suitable weight: all cats and small dogs (6kg / 13lbs) Material: durable ABS plastic, safe and non-toxic Size: Door size 30*30*4cm/11.8*11.8*1.6in Flip cover size 18.5*20.5/7.25*8in The package includes: 1 x Pet glass window door 3 short screws. 3 x long screws 3 nuts.