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Bifold Door Roller Replacement For bifold doors They are constructed from stainless steel and resist break 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 that weigh up 30 pounds. It fits System S1000 aluminum profiles. How do you recognize the broken roller on the bifold door Bifold doors are an excellent solution to save space in