The spot welder pen comes standard with a pair of Japanese concentric ballpoint needles, which is effective. This 18650 battery spot welding pen, suitable for longterm work, improve work efficiency, made of thick brass bar. The appearance is clean, and the heat dissipation is fast. It is suitable for assembling battery packs. Brass bars are cleaned and protected by strong acid to the brightness of the brass bars. The handle has double springs to expand and contract, and each soldering pen is independently expandable, with moderate force control. Not happen that the common onepiece spot welding pen cannot attain the pressure of the two welding needles, resulting in weak welding, large and low work efficiency. Colour:Blue Material:Metal Package Contents: 1 x Spot Welding Machine Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.