Ordinary one-piece spot welding pens often fail to achieve pressure balance between the two welding needles, resulting in weak welding, large sparks, and low work efficiency. This spot welding pen comes standard with a pair of Japanese concentric ball bearing needles for efficient welding. The clean appearance and rapid heat dissipation make it suitable for battery assembly. The brass rods are cleaned and protected with strong acid to ensure their shine. The handle features double springs for expansion and contraction, with each soldering pen independently expandable and moderate force control. This 18650 battery spot welding pen is suitable for long-term work, improving work efficiency and made from thick brass rods. Features: 1. The spot welding pen comes standard with a pair of Japanese concentric ball bearing needles for efficient welding. 2. This 18650 battery spot welding pen is suitable for long-term work, improving work efficiency and made from thick brass rods. 3. The clean appearance and rapid heat dissipation make it suitable for battery assembly. The brass rods are cleaned and protected with strong acid to ensure their shine. 4. The handle features double springs for expansion and contraction, with each soldering pen independently expandable and moderate force control. 5. Ordinary one-piece spot welding pens often fail to achieve pressure balance between the two welding needles, resulting in weak welding, large sparks, and low work efficiency. Specifications: Item Type: Battery Spot Welding Pen Material: ABS Brass Uses: Suitable for industrial spot welding Current: 800A Package List: 1 x Spot Welding Pen 2 x Concentric Ball Bearing Needles 2 x Spring 1 x Hex Wrench