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Bifold Door Roller Replacement These rollers can be used for bifold doors. They are made from stainless steel, and they resist breakage and wear for a long time. They have a large capacity for load bearing to support the weight of your doors and are easy to set up. This nylon roller guide for the top is designed to replace bi-fold doors panels that weigh up 30 pounds. It fits aluminum profiles of System S1000. How do you recognize a damaged