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POLOLOCK nylon hanging roller for compatible sliding-door hardware. Source data lists 60 kg and 80 kg load options, with a double-row four-wheel structure that distributes force across multiple points. The nylon wheels are described as tough, wear-resistant and pressure-resistant, with smooth and quiet sliding. Confirm the selected load option, track compatibility and installation dimensions before ordering. Do not exceed the stated load and check the track and fasteners before use.