apdepth of cut (mm)apdepth of cut (mm)apdepth of cut (mm)apdepth of cut (mm) Small Hole Boring Chipbreaker Geometries „Single-Sided, Positive Inserts ..HB Flat inserts. Peripheral ground for best surface quality and reducedcutting pressure. Very stable cutting edge offers maximum rigidity.P M K feed rate (mm) fn ..HT Peripheral ground insert chipbreaker. Good chip control. Geometry forgeneral-purpose applications.P M K feed rate (mm) fn ..HB-M Cubic Boron Nitride (CBN) or Polycrystalline Diamond (PCD) tip for high-temp alloys and non-ferrous machining. Very stable cutting edge offers maximum rigidity. K feed rate (mm) fn ..LF Geometry for general-purpose applications. Very good chip control.Recommended for general finish machining.P feed rate (mm) fn D34 widia.com