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Bifold Door Roller Replacement These rollers are suitable for bifold doors. They are made of stainless steel, and are resistant to breaking and wear for long-term usage. They have a large capacity for carrying the door's weight, and are easy to set up. This top nylon roller guide was designed to be used as a replacement for bi-fold doors weighing up 30 pounds. It fits aluminum profiles of System S1000. How to identify broken rollers on the bifold door Bifold doors a