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