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Bifold Door Roller Replacement These rollers are ideal for bifold doors. They are made of stainless steel, and they resist breakage and wear for a long time. They have a high capacity for load bearing to support the door's weight, 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 weighing up 30 pounds. It can be used with aluminum profiles from System S1000. How do you identify a damaged bifold door roller Bifold doors are ideal for