MTE D (DOUBLE INSERT) : Double insert thread milling end mills
COOLANT                                            
  DesignationapDdD2L1LShankkgGICATGIREMgiic
  MTE D20.0-2-W20-14 14.0020.0020.00016.0041.0093.00W0.2006198631 0
  MTE D30-2-W25-21 21.0030.0025.00024.0052.00108.00W0.4006198632 0
  MTE D40-2-W32-30 30.0040.0032.00030.0070.00130.00W0.7006198633 0
  MTE D50-2-W40-40 40.0050.0040.00038.0078.00153.00W0.8006198634 0

Minimum bore should be one-third larger than D (diameter)
All end mills are equipped with a bore for internal coolant