Made of high-strength alloy through integrated precision casting and enhanced by precise heat treatment, it features high hardness, good toughness, and excellent resistance to impact, fracture and deformation. The tooth end and contact surface are finely polished with accurate fitting clearance, ensuring smooth and unobstructed gear shifting. Compatible with ZF heavy-duty truck transmission for second and third gear operation, it withstands frequent gear shifts and heavy-load bumpy road conditions. With wear and fatigue resistance, it effectively solves poor shifting and gear jumping problems. It fully conforms to original factory specifications with good interchangeability, serving as a cost-effective preferred part for transmission maintenance and replacement.