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Bifold Door Roller Replacement These rollers are suitable for bifold doors. They are made of stainless steel, and resist breakage and wear for long-term use. They have a high load-bearing capacity to support the weight of your doors, and are easy to install. This nylon roller guide for the top was designed to replace bi-fold door panels up to 30 pounds. It fits System S1000 aluminium profiles. How do yo