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