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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. The issue is easily fixed with a simple DIY solution. Stainless steel bifold door rollers are resistant to breakage for long-term use. They can be easily installed with hardware that is included for easy installation. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a thermoplastic substance with outstanding mechanical prop