ITEM NAME:20-Pack Grey WC20 1.6x150mm Tungsten Electrodes Rods for Tig Welding Machine Description: WT20:2% thoriated tungsten electrodes (AWS classification EWTh-2) contain a minimum of 97.30% tungsten and 1.70 to 2.20% thorium.ost commonly used electrodes today and are preferred for their longevity and ease of use. WC20:2% ceriated tungsten electrodes (AWS classification EWCe-2) contain a minimum of 97.30% tungsten and 1.80 to 2.20% cerium. 1.0/1.6mm for option 10pcs/Box for Tig Welding Machine Specification: Material: Metal Color: as shown Package Includes: 20 Pieces Tungsten Electrodes.WC20:2% ceriated tungsten electrodes (AWS classification EWCe-2) contain a minimum of 97.30% tungsten and 1.80 to 2.20% cerium. for Tig Welding Machine. 20 Pieces Tungsten Electrodes. 1.0/1.6mm for option.