When the elongate body is driven to advance towards a material, {HEAD ~ the drill member} is operative to drill {TAIL ~ a hole} through the material 
is operative to drill
When the elongate body is driven to advance towards a material , { HEAD ~ the drill member } is operative to drill { TAIL ~ a hole } through the material
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH