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Bifold Door Roller Replacement For bifold doors, these rollers are made from stainless steel and resist break and wear for long-term use. have a large 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 bifold doors panels that weigh up to 30 pounds. It can be used with System S1000 aluminium profiles. How do you recognize a broken bifold d