Can be used in production machinery, testing equipment, optical experimental measurement, fine-tuning displacement, precision positioning, quantitative movement and so on. Main body aluminum alloy material, black anodized surface, scratch-resistant, anti-drop, anti-corrosion. Nickel plated locking screw, designed with counterbore, nickel plated fine adjustment knob, carbide side head, The driving method is a micrometer, which can be realized: manual coarse adjustment of 360 degrees, fine adjustment of rotation ± 5 degrees. High precision, smooth movement, suitable to be built in other devices.