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 center grooved sliding screen door tension roller that is used by a variety of sliding patio door manufacturers. Used on the bottom as well as the top of the sliding screen door. The roller is a 1 Inch diameter high density polyethylene roller. The tension spring is 2-1/2 Inch long and is a heat treated high tension steel spring. For the stainless steel use Prime-Line part B 573. Order yours today and have your door slide like new.