UA 500 Arc Stud Welding MachineStud Welding Range 10 gauge (3mm) through (M14) diameter studsStandard FeaturesSingle-Phase Transformer, RectifierVariable Voltage Input 208230460Continuous Current Control up to 900AmpsContinuous Time Control .05 to 0.7 secondsSolid-State CircuitryWheel-mounted, heavy-gauge Steel case with HandleTool-box on-boardComplete System includes Standard Duty Weld Gun, Ground Cable, and Extension Cable Set.