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DIY Bifold Door Roller Replacement The bifold door roller is a common point of failure in internal doors with light weights. The issue can be fixed by using an easy DIY solution. The rollers are made of stainless steel and are impervious to breakage. They are easy to install with the included hardware. They are designed to be load bearing and have a smooth operation. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties. It is able to withstand heavy capacities for load