Pet Door Dog Cat Flap Door 4 Ways Lockable Smooth Plastic Easy To Install Pet Security Door Puppy Kitten Safety Gate Dog Hole Features: Name: Pet Door Size: S: Inner diameter: height 17*width 16*thickness 2cm Outer diameter: height 20*width 20*thickness 2cm M: inner diameter: height 17*width 16*thickness 5cm Outer diameter: height 20*width 20*thickness 5.3cm L: inner diameter: height 21*width 19.5*thickness 5cm Outer diameter: height 25*width 23.5*thickness 5.3cm XL: inner diameter: height 24*width 21*thickness 5cm Outer diameter: height 28*width 25*thickness 5.3cm Material: ABS Color: white/brown Package: 1 piece 4 switch modes can control in and out of fashion by setting the button, thus you dont need to worry about the safety of pet. It is very easy to install that you just need to tighten the screws and ensure its stability. Made of ABS, It is very durable and solid to use. There are three sizes for choice. It is very suitable for pet, including dog, cats, rabbits, etc. Note: 1. Please make sure to measure your dog or cat for accurate sizing before purchasing to ensure the perfect fit. 2. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 3. Please allow slight dimension difference due to different manual measurement.please accept 1-3 cm error.