Each of the longitudinal surfaces 1 b, 1 c extends upwardly into a crest 30, which defines {HEAD ~ the highest level} of {TAIL ~ the cutting insert portion} with height h above the neutral plane P 
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Each of the longitudinal surfaces 1 b , 1 c extends upwardly into a crest 30 , which defines { HEAD ~ the highest level } of { TAIL ~ the cutting insert portion } with height h above the neutral plane P
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH