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