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