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Bifold Door Roller Replacement For bifold doors These rollers are constructed from stainless steel, and are resistant to wear and breakage for a long-term use. They have a strong capacity for carrying the weight of your doors, and are easy to set up. This nylon roller guide for the top was designed to replace bifold doors panels that weigh up to 30 pounds. It fits Aluminium System S1000 profiles. How do you identify a broken roller on the bifold door Bif