Used to strike and maintain a TIG welding arc. In ‘red-tip’ Thoriated (DC negative) for mild & stainless steel, etc, ‘white-tip’ Zirconiated (AC) for aluminium etc, ‘grey-tip’ Ceriated (AC/DC) for a range of ferrous and nonferrous metals - with excellent ignition, and ‘black-tip’ (1%) or ‘gold-tip’ (1.5%) Lanthanated (AC/DC) for ferrous & non-ferrous metals - with good re-ignition. Pure tungsten ‘green-tip’ also available. 150mm long.