Type schematic (not to scale) of a MIG nozzle, labelled with the printed size and nozzle mount cited in the specifications below; this part's outside diameter, bore and length are not in our sources.
Bernard N1B58Q MIG nozzle
Bernard N1B58Q Nozzle 5/8", Brass, Thread-On: size 5/8 in, material Brass, nozzle mount Thread-On.