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Sb70 Outer Bush Inner Bush for Hammer Breaker. High Wear Resistance: Made of alloy steel with HRC 45-52 hardness for long working time. Wide Compatibility: Fits excavators 3-50 tons and models like HB20G, SB40, SB50. Customization Support: Accepts OEM/ODM orders and custom designs based on customer needs. ISO Certified Quality: Manufactured under ISO 9001:2000 certification with 100% inspection. Fast Delivery: Standard delivery time is 2-5 working days after order confirmation.