{HEAD ~ An enlarged portion} 84 at the rearward end of the shank 82 defines {TAIL ~ a forwardly facing surface portion} 86 for engagement by a yoke 88 of a drive tool 90 
defines
{ HEAD ~ An enlarged portion } 84 at the rearward end of the shank 82 defines { TAIL ~ a forwardly facing surface portion } 86 for engagement by a yoke 88 of a drive tool 90
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH