This is a replacement gear box for the HuiNa 1550, 1560, and 1570 models. Specifically designed for the large arm component, this part ensures continued functionality and performance of your RC construction equipment. It is a genuine Huina part, identified by the part number CYP1001. This gear box is essential for the proper operation of the arm movement, providing the necessary torque and precision. It is compatible with various HuiNa RC excavators and other machinery that utilize this specific arm assembly. Ensure your equipment remains in top working condition with this vital component.