The spot welding pen comes standard with a pair of Japanese concentric ball needles, which are efficient. This 18650 battery-based spot welding pen is suitable for long-term use and improves work efficiency. Made of a thick brass bar, it has a clean appearance and fast heat dissipation. It is suitable for battery assembly. The brass bars are cleaned and protected with a strong acid to ensure their shine. The handle has double springs for expansion and contraction, and each soldering pen is independently retractable with moderate force control. Battery-based spot welding pen, battery-based spot welding pen, torch pen, mini welder, lithium battery, mini soldering iron, welding pen, welding pen, 18650 spot welder, spot welding kit. Features: 1. The spot welding pen comes standard with a pair of Japanese concentric ball needles, which is efficient. 2. This 18650 battery-based spot welding pen is suitable for long-term use and improves work efficiency. It is made of a thick brass bar. 3. It has a clean appearance and fast heat dissipation. It is suitable for battery assembly. The brass rods are cleaned and protected with a strong acid to ensure their shine. 4. The handle has double springs for expansion and contraction, and each soldering pen is independently retractable with moderate force control. 5. It is not possible for the ordinary one-piece spot welding pen to fail to achieve pressure equilibrium between the two welding needles, resulting in a weak weld, large sparks, and low work efficiency. Specification: Product Type: Battery-Powered Spot Welding Pen Material: Brass, ABS Application: Suitable for industrial spot welding Operating Voltage: DC 4-12V Current: 800A Package List: 1 x Spot Welding Pen 2 x Concentric Ball Needles 2 x Springs 1 x Hex Wrench