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