However, in variations of the tip distal end surface 34, the annular surface may be positioned at {HEAD ~ an angle} to the normal plane ranging between {TAIL ~ 30°} and 5° 
However , in variations of the tip distal end surface 34 , the annular surface may be positioned at { HEAD ~ an angle } to the normal plane ranging between { TAIL ~ 30 ° } and 5 °
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 OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH