Made for taller sliding glass doors, this insert adjusts in height from 91 to 96 inches, covering door frames that standard-height pet doors simply can't reach. The 10 1/4 x 16 1/4 inch flap suits small to medium dogs, giving them a comfortable passage without an oversized opening that lets in drafts. A metal panel fastener lets the sliding panel move up out of the way when not in use and locks it in place so it can't tilt to one side, while precision installation fixtures keep the door panels aligned so they don't wobble or jam. An aluminum frame and tempered glass window keep the unit rigid and weather resistant, and a button locking mechanism shuts the flap closed with a single press. At 20.83 pounds, it's manageable for one person to install, and the reinforced hinge holds up in cold weather.