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Bifold Door Roller Replacement Suitable for bifold doors These rollers are constructed from stainless steel and resist break and wear for long-term use. These rollers are strong enough to support your door's weight and are easy to put in. This nylon roller guide for the top is designed to replace bi-fold doors panels that weigh up to 30 pounds. It fits aluminum profiles of System S1000. How to identify the broken bifold door roller Bifold doors are ideal for saving space in