MTECB-UN : Solid carbide internal threading end mills with internal coolant holes for UN threads
  DesignationTPIUNCUNFUNEFdDapLFluteShankGICATGIREMgiicGrade
  MTECB 06056C14 18UN 18.05/166.005.6014.8058.003C6213190 1TT9030 
  MTECB 06032C6 32UN 32.0810126.003.206.8058.003C6344779 1TT9030