【2 Double-Sided Suction Cup Grinding Sticks】Help you properly adjust the throttle seat when rebuilding a high-end engine. These tools include dual tips with oil and UV resistant synthetic rubber suction cups to help you complete the final humidification of the environment. 【Ergonomic Design】Easy to use, high work efficiency. Compact size, lightweight and portable, easy to store and carry. 【Convenient to Use】Remove any carbon deposits on the valves and wipe each valve, install the valve into the valve guide, press firmly to the correct position. Place the suction cup on the valve head and gently rotate the tool handle between your palms (like trying to start a F). Note: The data is all measured manually. Due to differences in light and display, there may be 1-3cm deviation, please refer to the actual item received.