This protector far exceeded my expectations. They don't do a very good job in the ad explaining how it installs. It's much cleaner and easier than you could hope for. The images in the instructions instructions aren't the best, but with some intuition it wasn't too bad figuring out the assembly. Only took a few minutes to put together. But here's where it got good. The protector is designed to fit within the screen door space on the inside, using the inside channels running down both sides where the screen is. So it doesn't mount on the face of the screen door, but cleanly within that small cavity up against the screen. There are small pivot pins art each lower corner. You simply cock the screen at an angle to get both of those pivots in the channel on each side, then level and slide it down. Then pivot the screen up and there are spring loaded tabs on each upper corner of the protector to lock it into that same channel.