Made of integrated high manganese cast steel blank with medium-frequency deep quenching on wheel surface at HRC53~58, impact-resistant and edge-crack proof under rocky mining conditions. Equipped with triple dust lips plus double floating oil seals to block mud and water and prevent internal oil leakage. OEM-size casting perfectly matches 5G track adjuster to avoid track deviation and derailment, available in standard and heavy-duty reinforced versions. Manufactured directly by Tianjin Longdong Factory, items in stock with cost-effective factory price, 12-month warranty and OEM marking service supported.