... , GB/T 3.Parts: bolt and nut 4.Woodencase Pure Titanium Bolt: 1. Material: Gr1, Gr2, Gr3, Gr4, Gr5, Gr7 ... slot, square socket, phillips recess6. Screw Varieties: titanium cylindrical screw, titanium head screw, titanium pan head screw , titanium square head screw titanium hexagon srew, titanium slot word screw, titanium cross slot screw.7. Parts: ... as the parts of the cars,the bikes pure titanium bolt