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DIY Bifold Door Roller Replacement The bifold door roller is a frequent issue with internal doors that are light-weight. The issue is easily fixed by using an easy DIY solution. Bifold door rollers made of stainless steel resist breaking for long-term use. They can be installed easily with the hardware included for straightforward installation. They are designed to be load bearing and smooth in operation. Nylon Wheel Nylon is a Thermoplastic material with exceptional mechanic