5/8" Nozzle For 200 - 350 Amp Spray Master MIG Guns. Velocitys mating threads share a soft material (brass) along with a hard material (stainless steel). The combination of soft threads against hard reduces seizing and cross threading. Heat-treated stainless threads on the gooseneck are virtually indestructible and the brass threads on the replaceable nozzle are softer, so they grip and wont loosen. Package of 10