Fits Large Sized Pets: Dog door replacement flap measures 10 1/8 inches (W) x 16 7/8 inches (L), the insulation pack measures 10 1/16 inches (W) x 16 7/16 inches (L), and there are 5 holes at the top of the flap. Heat and Cold : Doggie door replacement flaps feature a double-flap design with built-in insulation to withstand all types of inclement weather, with temperatures ranging from -20°F to 120°F. Ideal for use in extreme climates Flexible and : Doggy door replacement flap is fitted with a magnetic strip at the bottom to that the flap closes safely and securely when the pet passes through, preventing mosquitoes from entering Easy Installation: Pet door replacement flap installation process is simple and quick, no complicated tools are needed, just a common screwdriver with our included screws can complete the installation Note: Before ordering a dog door flap, please make sure you check the location and size of the screw holes on your home's dog door to that the flap perfectly match your existing dog door Color: As Shown Material: Pvc Package Contents: 3 Flap x Large Dog Door Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.