Are you having trouble sliding your screen door open or closed? Have you checked your rollers/roller assemblies? Don’t replace the entire door. For a fraction of the cost of a new door, replace those worn-out rollers. This is a tension spring roller assembly with a flat downward offset tension spring used by Academy and a variety of other sliding patio door manufacturers. The roller is a 1 Inch stainless steel ball bearing roller assembly with a 1-3/4 Inch long tension spring that is a heat treated stainless steel spring. When installed the bent or angled flat spring positions the roller assembly so that an adjusting screw adjusts the height of the roller as needed. For other rollers of the same design use Prime-Line parts B 638, B 687 and B 639. Order yours today and have your door slide like new.