{HEAD ~ The bit assembly} comprises {TAIL ~ an elongated housing} having a first end adapted for engagement with the drill and a second end, including the cutting cone, for engaging the material to be drilled 
comprises
{ HEAD ~ The bit assembly } comprises { TAIL ~ an elongated housing } having a first end adapted for engagement with the drill and a second end , including the cutting cone , for engaging the material to be drilled
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH