... Gr1,Gr2,Gr3,Gr5,Gr9,Gr12etc About profacts: titanium bar rod Titanium and Titanium alloy specifications: 1)Common Ground a, Diameter:0 ... .1mm~300m b, Length:within6000mm c, Standard:GB,DIN ... ,Gr12,Gr23 2)Difference: a, Titanium for the chemical aspects,PCBequipment,electrodes. b, Titanium alloy used in Bicycle,Motorcycles,Electric ...