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