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Bifold Door Roller Replacement Ideal for bifold doors They are constructed of stainless steel and resist wear and breakage for long-term use. 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 a broken bifold door roller Bifold doors can be a great solution for saving space in closets. However, they may cause problems in time. M