Centerfire™ Thread-On nozzle (Small), 5/8 inch Bore, 1/8 inch Recess, Copper. For use with Bernard MIG Guns. No tools required to replace nozzle or contact tip with unique Centerfire design. Spatter shield within nozzle holds tip in place, protects diffuser and directs gas evenly with reduced turbulence. Threaded nozzles come in a variety of materials, shapes and bore sizes. Rugged nozzles include a ceramic insulator for extended life, withstand heat and abuse.