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DIY Bifold Door Roller Replacement The bifold roller is the most common failure point in internal folding doors. A simple DIY solution is available to solve the issue. Stainless steel bifold door rollers are resistant to breakage for long-term use. They are designed to be easily installed with hardware that is included for easy installation. are designed to support loads and have a smooth operation. Nylon Wheel Nylon is a Thermoplastic material with excellent mechanical properties. It can withstand high