The lance 3, wherein the opening width in the circumferential direction is about four to eight times larger than the wall thickness of {HEAD ~ the webs} in {TAIL ~ the circumferential direction} 
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The lance 3 , wherein the opening width in the circumferential direction is about four to eight times larger than the wall thickness of { HEAD ~ the webs } in { TAIL ~ the circumferential direction }
OTH OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL