This X-large pet door is sized for bigger dogs, with a 13 5/8 x 23 5/8 inch flap that gives large breeds plenty of room to pass through without squeezing. Three overlapping magnetic flaps rest flush against the full metal Q235 steel frame, cutting down on drafts, rain, and dust while resisting warping from repeated daily use. It fits doors from 1 1/16 to 2 inches thick and installs with the included hardware, making it suitable for exterior doors, garden doors, or interior walls. At 15.4 pounds and 28.0 x 17.2 x 3.0 inches overall, the sturdy frame and reinforced flap rigidity are built to handle a large dog's daily coming and going while keeping the opening weatherproof and secure.