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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure issue in doors that fold internally. The issue is easily fixed by using an easy DIY solution. Bifold door rollers made of stainless steel are resistant to breakage for long-term use. They are designed to be installed easily with the hardware included for straightforward installation. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a Thermoplastic material that