B.W.P 2% Thoriated Tungsten Electrodes Mixed 0.040" 1/16" 3/32" 1/8"7" WT20 Ground Finish Kit For TIG Welding WT20 2% Thoriated Tungsten Electrodes For TIG Welding. Ground finish quality. Applicability: AC welding: thin-gauge aluminum and material less than 0.060" DC welding: Carbon steel, stainless steel, nickel, and titanium. At this price, you will get: 2pcs 0.040"*7" (1.0*175mm); 3pcs 1/16"*7" (1.6*175mm); 3pcs 3/32*7" (2.4*175mm); 2pcs 1/8*7" (3.2*175mm)