Junior adjustable top fixture in 16-gauge steel, sold individually. Mounts at the top of the top panel and holds the roller that guides the door into the track when it starts moving. This adjustable design lets you dial in the door's position against the header, which helps with sealing and smooth travel. These get swapped out when they are bent, worn, or the roller slot is wallowed out and the roller keeps popping loose. One bracket per unit here, so order two if you need both sides. Match the mounting holes and roller stem size to your setup.