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DIY Bifold Door Roller Replacement The bifold door roller is a frequent point of failure in internal doors that are light-weight. The issue can be fixed by using an easy DIY solution. Bifold door rollers made of stainless steel resist breakage for long term use. They are designed to be installed easily with the hardware that is included for easy installation. They are designed to support loads and operate with ease. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical pro