A rotary drilling tool has a plurality of {HEAD ~ cutters} mounted on {TAIL ~ the tool body} and formed with cutting edges defining a cutting profile 
A rotary drilling tool has a plurality of { HEAD ~ cutters } mounted on { TAIL ~ the tool body } and formed with cutting edges defining a cutting profile
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH