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Bifold Door Roller Replacement Ideal for bifold doors They are constructed from stainless steel and resist wear and breakage for a long-term use. They are sturdy enough to withstand your doors' weight and are easy-to-install. This nylon roller guide for the top was designed to replace bi-fold doors panels that weigh up to 30 pounds. It can be used with System S1000 aluminium profiles. How to i