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Bifold Door Roller Replacement Suitable for bifold doors They 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 put in. This nylon roller guide for the top is designed to replace bi-fold doors panels that weigh up to 30 pounds. It is compatible with aluminum profiles from System S1000. How to identify a broken roller on a bifold door Bifold doors are a great space-saving solution for closets