This product is a genuine Traxxas steel rear axle shaft designed to deliver maximum strength and durability for high-stress drivetrain applications. The hardened steel construction provides excellent resistance to twisting and wear under heavy loads and aggressive driving conditions. It ensures smooth and reliable power transfer to the rear wheels while maintaining proper drivetrain alignment. This axle shaft is specifically engineered for rear installation to meet factory performance standards. It is compatible with the Traxxas Unlimited Desert Racer (UDR) and is an ideal replacement or upgrade for restoring dependable rear drivetrain performance.