Model "B" large ball point screw connection. Electrode can be used to within one inch of the Shortstub's® head. Built to last with a proven high impact, high heat separate and easy to install replacement head. Designed to greater improve productivity with a quick and easy installation of electrodes, eliminating total replacement. Centerfire consumable series Contact Tips, Gas Diffusers, Nozzles, and Tapered Contact Tips are machined to the highest quality for extended service life. Adapter Heads and Insulator Caps are available to convert indicated tools to use Centerfire consumables. Shortstub® manual products provide quick, easy electrode installation for improved productivity.