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