This is a top quality spot soldering pen with thick copper bars that help improve efficiency and are suitable for long periods of use. The one-piece design is beautiful and neat, with good heat dissipation. Double spring inside the handle, each soldering pen can be retracted independently. Built-in limit switch, one-handed operation, no foot pedal required. You can try it. Features. Thick copper bar is used, which is conducive to higher working efficiency and suitable for long time use. Integrated design, beautiful and neat, good heat dissipation. Double springs inside the handle, each soldering pencil can be retracted independently. Built-in limit switch, one-handed operation, no foot pedal required. Comfortable in the hand, withstands long time use, stable and reliable, wear-resistant and labour-saving. Suitable for 18650 battery spot welding machine Note: External 12V power supply Specifications. Name: Spot welding pen Welding Product size:125.7*41.5mm Color:Black Packing list1* Spot Solder Pen