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DIY Bifold Door Roller Replacement The bifold roller is the most common failure issue in doors that fold internally. The issue is easily fixed by using an easy DIY solution. The rollers are constructed of stainless steel and are impervious to breakage. They are simple to install with the included hardware. They also have load bearing and designed for smooth operation. is a Thermoplastic material with excellent mechanical properties. It is able to withstand large loads and even some impact wi