Namsan Pet Screen Door - Pet Window Screen Dog Door Screen Door for Cats Dogs Size - Flap opening size is 8.25" W x 10.4" H, For small dogs and cats. Feature - This swinging wire mesh pet door is built with high-impact plastic, and includes a sliding lock to a control your pet's access. Usage - Frame mounts directly through any standard screen door to provide a discrete and attractive entrance for your pet . Magnetic Flap Closures - give the door a strong seal when the door is not in use for added protection. Easy to Install - Detailed installation instructions included .