The drilling/reaming tool 1 wherein the reamer flutes are wound in {TAIL ~ the opposite direction} to {HEAD ~ the main flute} 
The drilling / reaming tool 1 wherein the reamer flutes are wound in { TAIL ~ the opposite direction } to { HEAD ~ the main flute }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD