It is not possible that the common one-piece spot welding pen cannot achieve the pressure balance of the two welding needles, resulting in weak welding, large sparks and low working efficiency . The spot welding pen comes standard with a pair of Japanese concentric ball needles, which is effective. The appearance is clean and the heat dissipation is fast. It is suitable for assembling batteries. The brass bars are cleaned and protected with a strong acid to ensure the shine of the brass bars. The handle has dual springs to expand and contract, and each soldering pen is independently extendable, with moderate force control. This 18650 battery spot welding pen, suitable for long-term work, improve work efficiency, made of thick brass bar. Feature: 1. The spot welding pen comes standard with a pair of Japanese concentric ball needles, which is effective. 2. This 18650 battery spot welding pen, suitable for long-term work, improve work efficiency, made of thick brass bar. 3. The appearance is clean and the heat dissipation is fast. It is suitable for assembling batteries. The brass bars are cleaned and protected with a strong acid to ensure the shine of the brass bars. 4. The handle has dual springs to expand and contract, and each soldering pen is independently extendable, with moderate force control. 5. It is not possible that the common one-piece spot welding pen cannot achieve the pressure balance of the two welding needles, resulting in weak welding, large sparks and low work efficiency. Specifications: Item Type: Battery Operated Spot Welding Pen Material: ABS Brass Uses: Suitable for industrial spot welding Current: 800A List of packages: 1 x spot welding pen 2 x concentric ball needle 2 x spring 1 x hex wrench