WeldingCity 10-pk Premium TIG Welding Tungsten Electrode Rod 2.0% Thoriated (Red, EWTh20) .040" x 7" | 10-pcs 10-pcs premium quality TIG welding Tungsten electrodes (0.040") 2.0% Thoriated (Red, EWTh20-040). 0.040" (1.0mm) diameter by 7" (175mm) length. Ground annealed. AWS Specification: EWTh20. Conform to ANSI/AWS Standard A5.12M/A5.12:2009 ISO 6848:2004 MOD. All relevant TIG parts (2nd picture) working with these electrodes are available from our store. To select correct Tungsten Electrode please refer to the listed chart (3rd picture. For Reference Only). U.S. based welding supplier. Strong technical support with experienced customer service to address buyer's any question. MSDS available per request.