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Bifold Door Roller Replacement These rollers are ideal for bifold doors. They are made from stainless steel, and resist breaking and wear for long-term use. They have a strong load-bearing capacity to support the weight of your doors, and are easy to set up. This top-quality nylon roller guide was designed to be used as a replacement for bi-fold door panels that weigh up 30 pounds. It fits aluminum profiles from System S1000. How do you identify the broken roller