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Bifold Door Roller Replacement Suitable for bifold doors These rollers are constructed from stainless steel, and are resistant to wear and breakage for a long-term use. They are sturdy enough to support your doors' weight and are easy-to-install. This nylon roller guide for the top is designed to replace bi-fold door panels that weigh up 30 pounds. It fits aluminum profiles from System S1000. How do you i