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Bifold Door Roller Replacement These rollers are ideal for bifold doors. They are made from stainless steel, and are resistant to breaking and wear for long-term usage. They have a high load-bearing capacity to support the door's weight, and are easy to set up. This top-quality nylon roller guide is made to be used in bi-fold doors weighing up 30 pounds. It is compatible with aluminum profiles of System S1