Equipped with a rotary knob for easy, ensuring optimal clamping dimensions for various tasks Features high hardness needle tips that quickly penetrate copper tubes, enabling efficient recovery of refrigerants from air conditioners, refrigerator Copper allows immediate drilling through refrigerator or cold storage charging pipes, facilitating exhaust or refilling High tension reset spring provides smooth opening and closing, while the reinforced elastic spring delivers powerful rebounding Easily pierces 1mm thick copper tubes, ideal for post repair welding and maintenance tasks in HVAC and refrigeration, Manufacturer: Shurhome