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