Centerfire™ Contact tips are easy-to-use and high performing. They provide better arc starts, less spatter and more consistent welds and also last up to three times longer than competitive brands. They are non-threaded and stay in place by hand-tightening the nozzle. They change over without tools for quick, easy replacement after burn back. It has a tapered base to improve conductivity and reduce heat for better weld quality. Tips can be rotated 360°. They are machined to the highest quality for the smoothest performance.