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Tool Lower Upper Bush Hydraulic Rock Breaker Hammer Hb20g Outer Bushing for Construction Machinery Excavator Part. High Wear Resistance: HRC 45-52 hardness ensures long working time and superior wear resistance. Wide Compatibility: Fits excavators 3-50 tons and chisel diameters 68-175 mm for multiple models. OEM/ODM Capability: Accepts custom designs and samples with 20 years of specialized manufacturing experience. Fast Delivery: Standard delivery time is 2-5 working days after order confirmation. Quality Assurance: ISO 9001:2000 certified with 100% visual and function inspection for finished products. Professional Service: Provides video online support and 1-month warranty for all purchased parts.