It is a kind of fine quality spot welding pen, adopt thick copper bar, help improve the work efficiency, and suitable for long service time. Integrated design, beautiful and neat, with fine heat radiation effect. There are dual sources on the handle, each welding pen can be expanded independently. Integrated limit switch, one hand operation, no need for pedal. You can try. Features: Adopt thick copper bar, help improve work efficiency, and suitable for long service time. Integrated design, beautiful and neat, with fine thermal radiation effect. There are dual sources on the handle, each welding pen can be extended independently. Built-in limit switch, one-handed operation, do not need pedal. With comfortable hand feelings, can support long time use, stable and reliable, wear-resistant and effort saving. Suitable for welding machine by 18650 battery points. Note: Please connect to 12V external power source. Features: Name: Welding Pen spot Color: white, blue, green, black, yellow, red (optional) Welding needle sharpener: 50 * 3 * 3mm / 1.97 * 0.12 * 0.12in Item size: 155 * 45 * 25mm / 6.10 * 1.77 * 0.98in Item Weight: 250 g / 8.82 oz Package size: 200 * 100 * 50mm / 7.87 * 3.94 * 1.97in Package weight: 300g / 10.58oz Packing List: 1 * Spot Welding Pen