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Self-lubricating and Maintenance-free: copper alloy + embedded graphite design is adopted, and the lubrication layer is automatically released during operation to reduce friction and wear. It is suitable for occasions where frequent refueling is not possible Size Description: Inner Diameter 16mm ; Outer Diameter 20mm ; Height 55mm Precise Size and Easy Installation: precision production, tolerance control at H7 level, ensure perfect fit with shaft parts, reduce vibration and noise, compatible with most shaft diameters, and easy installation Corrosion Resistance: water-resistant, steam-resistant and weak acid and alkali environments, suitable for humid, dusty or mildly corrosive working conditions, such as agricultural machinery, ships, industrial equipment, etc. Please check the size carefully before ordering