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