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