41GENERAL DRILLING HANDBOOKSOLID-DRILLSOLIDMILLDrilling and ChamferingSpot DrillingPre-Threading DrillingMODULARMODULARSOLIDSOLIDPre-ThreadMULTI-MASTERCHAM-DRILLCHAMRINGCombo Drills, Exchangeable Head and Indexable Insert DrillsInterchangeableDrilling Heads