... and best price screw A word trough screw and bolts Titanium and Titanium alloy specifications: 1)Common Ground a, Bolt sizes:M3-M22 ... :Gr1,Gr2,Gr3,Gr5,Gr7,Gr9,Gr12 2)Difference: a, Titanium for the chemical aspects,PCBequipment,electrodes. b, Titanium alloy used in Bicycle,Motorcycles ...