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Bifold Door Roller Replacement Suitable for bifold doors They are constructed from stainless steel, and are resistant to wear and breakage for a 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 doors panels that weigh up to 30 pounds. It is compatible with aluminum profiles of System S1000. How do recognize the broken bifold door roller Bifol