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