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