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Bifold Door Roller Replacement These rollers are ideal for bifold doors. They are made of stainless steel, and resist breaking and wear for long-term usage. They have a strong capacity for load bearing to support the door's weight, and are easy to set up. This nylon roller guide for the top was designed to replace bifold doors panels that weigh up 30 pounds. It is compatible with aluminum profiles from System S1000. How to identify a broken roller on a bifold d