"PREFLOW TIMER KIT ADJUSTS GAS PREFLOW TIME FROM 0 TO 15 SEC. WITH ON/OFF SWITCH, 1; SPOT TIMER ADJUSTS TIG SPOT WELDING TIME FROM 0 TO 5.7 SEC. WITH ON/OFF SWITCH, 1; RUNNING GEAR INCLUDED 10 IN. WHEELS, 2; 5 IN. CASTERS, 5; COMPARTMENT RACKS FOR GAS CYLINDERS OR COOLANT SYSTEM, 2"