The method used by auto manufacturers for building vehicles. Confines heat and prevents distortion. Allows welding from one side of metal. Ideal for working in hard-to-reach areas. Trigger release gun is ergonomically designed to prevent hand fatigue. Welds light (18- to 26-gauge mild steel) sheet metal panels together. Kit includes 4-prong head for flat surfaces, 2-prong head for rounded/curved surfaces, approx. 4-1/2 ft. power cord (attaches to arc welder), 2 special electrodes and complete instructions. Package of 10 electrodes available separately (SKU # 811589T).