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Bifold Door Roller Replacement For bifold doors, these rollers are made from stainless steel, and are resistant to wear and breakage for long-term use. They are sturdy enough to withstand your doors' weight and are easy to install. This nylon roller guide for the top was designed to replace bifold doors panels that weigh up to 30 pounds. It is compatible with System S1000 aluminum profiles. How do you identify the broken roller on a bifold door