说明
Bracket: Made of heavy pressed steel. Bolted wheel axle. Zinc-plated, blue-passivated, Cr6-free. Wheel: Made of high-quality, impact-resistant nylon. Bearing type: Plain bore: corrosion-resistant. Ball bearing (C): A centrally encapsulated sealed ball bearing within the injected nylon, lubricated with long-life grease. Ball bearing: Two pressed-in ball bearings, lubricated with long-life grease. Roller bearing: lubricated with long-life