IHRF-BW : Back face turning toolholder for BHF and TCH fine boring heads.
  Designationd mind maxD1L1fl1GICATGIREMgiic
  IHRF 20-25BW 20.0025.0016.0027.58.018.004652463 0
  IHRF 24.5-32BW 24.5032.0020.0033.58.522.504652467 0
  IHRF 31.5-41.5BW 31.5040.0025.0041.59.528.504652475 0
  IHRF 38.5-51.5BW 39.0052.0032.0053.011.035.504652484 0
  IHRF 50.5-65BW 51.0065.0040.0068.013.546.004652496 0
  IHRF 56-802 BW 56.00802.0050.0062.017.553.004652508 0

D1= Size of the boring head being used. dmin= (min bore diameter)= (dmax+D1+1)/2