{HEAD ~ the first diameter} of said first parallel thread part is {TAIL ~ substantially 3.55 mm}; and 
{ HEAD ~ the first diameter } of said first parallel thread part is { TAIL ~ substantially 3.55 mm } ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH