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