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