Expands from 37 to 60 inches to accommodate extra wide openings all around the house. Can expand to an incredible 13 feet wide with the use of additional 24-inch extensions. Convenient walk-through design has an easy, one-touch release handle. Patented pet door is 10 inches by 7 inches to let small pets pass through, while everyone else stays put. Simple wall mounts are easy to install and remove. All-steel construction is sturdy, durable, lead-free, non-toxic and chew-proof.