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for Toyota Tie Rod Ball Joint OEM 4504639135 4504739115. High Durability Material: Outer shell uses 45# steel with rust prevention; inner rod uses 40cr steel for increased hardness. Proven Swing Endurance: Withstands 1,000,000 cycles of oscillation without loosening, ensuring long-term stability. Precision Assembly: Assembled with special grease to ensure optimal swing torque of 3-4N.m for smooth steering. Customization Options: Offers full customization, minor customization, and flexible customization based on samples or designs. Quality Assurance: Advanced CNC machining and comprehensive inspection systems ensure high dimensional accuracy.