The plug of {TAIL ~ filler material} fills the hole made by the fastener body when the fastener is driven into {HEAD ~ a workpiece} 
The plug of { TAIL ~ filler material } fills the hole made by the fastener body when the fastener is driven into { HEAD ~ a workpiece }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD