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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. The problem is easily fixable by using a simple DIY solution. The rollers are made of stainless steel and are impervious to breakage. They are simple to install using the included hardware. They are designed to be load bearing and operate with ease. Nylon Wheel Nylon is a thermoplastic product with outstanding mechanical properties. It is able to withstand large loads and even some impact without breaking, making it an ideal materia