Make strong spot welds while working from one side only with this spot welding attachment for your arc welder. Press the spot weld gun up against the area to be welded, pull the trigger and in seconds the carbon electrode will have produced a well penetrated spot weld in steel from 26g to 18g thick. Needs Max. 50 amps from your arc welder. Complete with leads, 2 heads, 2 carbon electrodes and instructions.