Adopt thick copper bar to enhance working efficiency and ensure long service life. Integrated design with a sleek appearance and effective heat dissipation. Dual springs on the handle allow each welding pen to expand and contract independently. Built-in limit switch enables one-hand operation; no foot pedal required. Ergonomic handle provides comfort during extended use, offering stability, durability, and reduced effort. Suitable for spot welding machines. Specifications: Name: Spot Welding Pen Welding Needle Size: 50 x 3 x 3mm / 1.97 x 0.12 x 0.12in Item Size: 155 x 45 x 25mm / 6.10 x 1.77 x 0.98in Item Weight: 250g / 8.82oz Color: Red + Black Material: Copper Package Contents: 1 x Spot Welding Pen Note: Connect to a 12V external power source. Package includes only the items listed above. Due to lighting and display differences, the item color may vary slightly from the image. Measurement error is +/- 1-3cm.