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DIY Bifold Door Roller Replacement The bifold door roller is a frequent problem in internal light-weight folding doors. is available to fix the problem. Stainless steel bifold door rollers are resistant to 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 be load bearing and operate with ease. Nylon Wheel Nylon is a Thermoplastic material with exceptional mechanical properties. It can withstand heavy loads a