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Bifold Door Roller Replacement For bifold doors These rollers are constructed of stainless steel and resist break and wear for long-term use. These rollers are strong enough to withstand your doors' weight and are easy to install. This nylon roller guide for the top was designed to replace bi-fold door panels that weigh up to 30 pounds. It can be used with aluminum profiles from System S1000. How do you identify a broken roller on a bifold door Bifold door