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Bifold Door Roller Replacement These rollers are ideal for bifold doors. They are made of stainless steel, and they resist wear and breakage for long-term usage. They have a strong load-bearing capacity to support the weight of your doors, and are easy to install. This top-quality nylon roller guide was designed to be used in bi-fold door panels weighing up 30 pounds. It is compatible with System S1000 aluminium profiles. How to identify the broken bifold door roller Bifold doors can be an excellent solution