Used to strike and maintain a TIG welding arc. In red-tip Thoriated DC negative for mild amp 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 amp non-ferrous metals – with good re-ignition. Pure tungsten green-tip also available. 150mm long.