Adopt thick copper bar, help enhance the working efficiency, and suitable for long service time. Integrated design, beautiful and neat, with fine heat radiation effect. There are dual springs on the handle, each welding pen can expand and contract independently. Built-in limit switch, one hand operation, do not need foot pedal. With comfortable hand , can support long time use, stable and reliable, wear and effort saving. Suitable for 18650 battery spot welding machine. Name: Spot Welding Pen Item size: 155 x 45 x 25mm / 6.10 x 1.77 x 0.98inch Usage: Welding 18650 Battery Machine Weight: 202g Model Number: Weld Machine Model Number1: DIY Spot Welding Pen Model Number2: Integrated Spot Welding Pen Hand-held with Automatic Trigger color:Blue Material:Metal Package Contents: 1 x Spot Welding Pen 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. Mini Spot Weld DIY Spot Welding Pen Weld Machine