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3 Inch Commercial Garage Door Guide Wheel 6200zz Bearing 7 Inch Stem. 6200ZZ metal-shielded bearing ensures frictionless, high-cycle performance under heavy commercial loads. Large 3-inch 100% Virgin PA6 Nylon construction absorbs vibration and minimizes track noise. Robust 7-inch galvanized solid stem easily accommodates heavy-duty industrial door applications.