Features: Portable 12V 16.8V relays spots welder set offer welding for 0.1 0.3mm strips, ideal for 18650 battery packs with adjustable power and sturdy 500A gold contact relays. Features power adjustment, automatic delay triggering, and copper wiring for low resistance connection, ensuring consistent performances on steel sheets. Designs for electronics repair technicians, battery pack assemblers, and enthusiasts seek professional welding tool for battery customization. Addition for automotive starter battery maintenance, home workshop projects, and industrial 0.3mm sheet bonding in confined workspaces. Combines EC5/car battery compatibility with fiber reinforced ergonomic grips, delivering 1500A surges capacity for stable welds on high capacity cells. Specifications: Component: Plastic Type: As Picture Show, Two Type to Choose Size: Thickness 0.01cm-0.03cm/0.0039-0.012inch Package Includes: 1pc Spots Welder note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.