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