This large pet door gives dogs and cats their own entryway with a 10 1/4 x 16 1/4 inch flap opening, sized for daily back-and-forth traffic without you having to open the door each time. Three overlapping magnetic flaps sit flush against the full metal Q235 steel frame, cutting down on drafts, rain, and dust while keeping the frame from warping over time. It installs into doors with a thickness of 1 1/16 to 2 inches, covering most bedroom, garden, and exterior doors, and comes with the hardware needed for a quick setup. At 9.9 pounds and 20.6 x 13.8 x 3.0 inches overall, it's compact enough for interior use but sturdy enough to hold up outdoors, giving pets independent access while you keep the main door closed and secure.