{TAIL ~ Cutting insert} 6 including a groove formed in the upper surface and extending in {HEAD ~ an axial direction} 
{ TAIL ~ Cutting insert } 6 including a groove formed in the upper surface and extending in { HEAD ~ an axial direction }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD