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20 ISCAR GENERAL DRILLING HANDBOOKApplicationDrills are categorized based on their intended application: %u2022 General Purpose Drill %u2013 Designed for thought and blind holes in various materials.%u2022 Centering Drill - Creates holes for holding parts between centers or with tailstocks in turning and grinding machines.%u2022 Spot Drill %u2013 Provides pre-location accuracy and a lead for stable drilling.%u2022 Deep Drill %u2013 Drilling holes on dedicated drilling machines with specialized drilling tools. Commonly used for drilling holes with a depth of 20D (hole depth = 20 x drill diameter) and more, but also can be used for drilling a shallower depth.%u2022 Stepped Drill %u2013 Drilling stepped holes by one drill.General-Use DrillCentral DrillSpot DrillDeep DrillStepped Drill