The Marquette 50 Amp Plasma Cutter cuts from sheet metal up to 1/2" steel.  Its instant pilot arc design easily cuts though paint, plating, and rust without any prior preparation.  This unit is ideal for metal fabrication shops, van and truck conversion shops, maintenance departments and farm shops. It uses clean dry compressed air for both plasma gas and cooling, with a built-in 0-to-100 psi regulator to control air pressure.  Two amperage settings (30-amp and 50-amp) allow control of speed and temperature best suited for the job.  Does not generate high frequencies which can damage sensitive electronics, making it great for auto body work.