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Bifold Door Roller Replacement These rollers are ideal for bifold doors. They are made of stainless steel, and they resist breakage and wear for long-term use. They are sturdy enough to support your doors' weight and are easy to put in. This top nylon roller guide was designed for replacement in bi-fold door panels that weigh up 30 pounds. It can be used with aluminum profiles of System S1000. How do you recognize a broken r