The cold working reamer 1, wherein the cutting edges include {HEAD ~ a plurality} of {TAIL ~ helical cutting edges} 
of
The cold working reamer 1 , wherein the cutting edges include { HEAD ~ a plurality } of { TAIL ~ helical cutting edges }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL