One drill head with three selectable diameters: 50 mm, 75 mm, and 100 mm. This is a single drill head (not a set) designed for coarse drilling on CNC lathes. Compatibility - Pairs with BT30, BT40, NT30, NT40, C20, C25, R8, MT2, MT3, MT4, and MTB4 tool holders. Note - Not a set. You get one drill head. Performance and benefits - Designed for efficient drilling operations in CNC lathe applications. - Three diameter options provide flexibility for different drilling requirements without changing heads. - Helps reduce tool changes and setup time while maintaining hole size accuracy. Use scenarios - Scenario 1: Coarse drilling of large holes on metal workpieces in CNC lathe production. - Scenario 2: Quick diameter changes during prototyping or small-batch fabrication, enabling multiple hole sizes with a single head. - Scenario 3: Maintenance or repair tasks where different hole diameters are needed in the same setup or fixture.