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