S-100 Type Cutting Nozzle Brass & copper material Model size #2,4,6,9,12 Used for welding torch S-100 Type Cutting NozzleBrass & copper materialModel size #2,4,6,9,12Used for welding torch Model No.SizeOrifice(mm)UW-117320.4UW-1173 40.8UW-1173 61.0UW-1173 91.2UW-1173 121.4