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Bifold Door Roller Replacement These rollers can be used for bifold doors. They are made of stainless steel, and they resist wear and breakage for long-term usage. These rollers are strong enough to support 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 30 pounds. It fits aluminum profiles of System S1000. How do you identify the