The Center Gateway Walk Thru Pressure Dog Gate installs quickly without tools or hardware, leaving no holes to damage walls or woodwork. The U-shaped frame indoor dog gate remains firmly installed while the center walk-through door opens in either direction. Constructed of heavy tubular steel with a nontoxic white plastic coating. This dog door gate is is 29.5" H and designed for openings of 29 1/4" to 37 1/2"W. Optional extensions (5.5”) are available for openings up to 48 1/8"W.