The fastener of the present invention is rotatable by {TAIL ~ a drive gear} for {HEAD ~ engagement} with a workpiece in a preselected forward direction 
The fastener of the present invention is rotatable by { TAIL ~ a drive gear } for { HEAD ~ engagement } with a workpiece in a preselected forward direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH