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Bifold Door Roller Replacement Ideal for bifold doors They are constructed from stainless steel, and are resistant to wear and breakage for a long-term use. have a strong capacity for carrying the door's weight, and are easy to set up. This top nylon roller guide is made to be used as a replacement for bi-fold doors weighing up 30 pounds. It can be used with aluminum profiles from System S1000. How do you id