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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 a long time. They have a high load-bearing capacity to support the weight of your doors, and are simple to put in. This nylon roller guide for the top was designed to replace bi-fold door panels that weigh up 30 pounds. It fits Aluminium System S1000 profiles. How do you recognize broken rollers on the bifold door Bifold doors are a f