{TAIL ~ A rotatable fastener} has {HEAD ~ a head portion} with an axially facing ring gear engageable with a complementary gear of a drive tool 
{ TAIL ~ A rotatable fastener } has { HEAD ~ a head portion } with an axially facing ring gear engageable with a complementary gear of a drive tool
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH