{TAIL ~ A drill} 5 in which the cutting face of each insert is generally flat but is convexly curved toward the platform adjacent the second corner so as to form the curved portion of {HEAD ~ the cutting edge} 
{ TAIL ~ A drill } 5 in which the cutting face of each insert is generally flat but is convexly curved toward the platform adjacent the second corner so as to form the curved portion of { HEAD ~ the cutting edge }
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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD