Therefore, when the cutting edges of the burnishing section are configured with the same profile as the cutting edges of the reamer section, {HEAD ~ the burnishing section} is in {TAIL ~ the form} of a backward reamer section 
is in
Therefore , when the cutting edges of the burnishing section are configured with the same profile as the cutting edges of the reamer section , { HEAD ~ the burnishing section } is in { TAIL ~ the form } of a backward reamer section
OTH 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 HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH