In one threading tool, the insert cross section forms substantially {HEAD ~ a hexagon} with {TAIL ~ two opposite sides} longer than the other four sides  
with
In one threading tool , the insert cross section forms substantially { HEAD ~ a hexagon } with { TAIL ~ two opposite sides } longer than the other four sides
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH