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