Max Heat Trigger Torch For Faster Work Times, For Job Site Projects Including Soldering Large Diameter Copper Pipes, Brazing, Heat Treating & Light Welding, The Large, Optimized Swirl Flame Provides Maximum Heat Output, The Auto Start/Stop Ignition Lights & Extinguishes With The Push Of A Button, Adjustable Flame Control Knob Makes It Easy To Size The Flame For Different Applications, Run Lock Button Keeps The Torch Lit For Continuous Use.