This is a high-quality spot welding pen, crafted with a thick copper bar to enhance work efficiency and ensure long-term use. The integrated design is sleek and efficient, providing excellent heat dissipation. Features dual springs on the handle, allowing each welding pen to expand independently. Built-in limit switch enables one-handed operation, eliminating the need for a foot pedal. Give it a try! Features: Utilizes a thick copper bar to improve work efficiency and is suitable for extended use. Integrated design offers a beautiful and tidy appearance with excellent heat dissipation. Dual springs on the handle allow each welding pen to expand independently. Built-in limit switch enables one-handed operation, eliminating the need for a foot pedal. Provides a comfortable grip, supporting long-term use, stable and reliable, wear-resistant, saving time and effort. Suitable for 18650 battery spot welding machines. Note: Connect to a 12V external power source. Specifications: Name: Spot Welding Pen Color: White, Blue, Green, Black, Yellow, Red (Optional) Welding Pen Grinder: 50 * 3 * 3mm / 1.97 * 0.12 * 0.12in Item Size: 155 * 45 * 25mm / 6.10 * 1.77 * 0.98in Item Weight: 250g / 8.82oz Package Size: 200 * 100 * 50mm / 7.87 * 3.94 * 1.97in Package Weight: 300g / 10.58oz Packing List: 1 * Spot Welding Pen