... Head: cheese, hexagon, pan2. Types of the Groove: slot, square socket, phillips recess3. Screw Varieties: titanium cylindrical screw, titanium ... head screw, titanium pan head screw , titanium square head screw titanium hexagon srew, titanium slot word screw, ... bolt and nut5. Intrinsic Quality: No organization segregation, no high density of its impurities6. Fine texture:A1~A47. Usage: ...