The drive element engages the top of the foremost fastener of {TAIL ~ the strip} of fasteners to force the fastener into {HEAD ~ a work piece} 
The drive element engages the top of the foremost fastener of { TAIL ~ the strip } of fasteners to force the fastener into { HEAD ~ a work piece }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD