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Track Roller Dozer D85 Track Roller Undercarriage Parts Construction Machinery Parts. Diverse Material Options: Available in 50Mn and 40MnB materials for optimal durability. High Surface Hardness: Surface hardness reaches HRC50-56 with a depth of 8-12mm. Multiple Color Choices: Offered in Black or Yellow finishes to suit various needs. Advanced Manufacturing: Produced using forging, casting, machining, and heat treatment techniques. Quality Assurance: Every piece is individually tested to ensure product safety and quality. Flexible Shipping: Delivery in 7-10 days for stock items, 25-30 days for standard orders. Customization Support: Accepts model numbers, serial numbers, dimensions, and drawings for fitment.