Never opened adjustable pet barrier for a car. Made from high quality powdered coated steel. Minimum Size: 12 inches high by 34 inches wide & Maximum Extension: 18 inches high by 56 inches wide" please take the time to measure your vehicle space, may not fit all vehicles, You must have adjustable headrest poles for this item to be mounted and work in your vehicle.Simple head rest mounting - Using the rectangular guide bar to position the guard on top of the back seat, the guard is quickly secured by tightening the holding brackets around the headrest posts ( must have adjustable headrest for mounting)Adjustable Vertical bars - Height is easily adjusted and the top bar can even be removed which is particularly useful for small cars where head room is an issueAdjustable horizontal bars - The cleverly designed telescopic bars ensure a perfect fit every timeRemoving the guard - Easy - just loosen off the tightening knobs and remove from the headrest posts - Minimum Size: 12 inches high by 34 inches wide & Maximum Extension: 18 inches high by 56 inches wide