OSG Flat Bottom Carbide Drill - Through Coolant 3xD - EGIAS Coated - 7.40mmThe OSG Flat Bottom Carbide Drill Through Coolant 3xD EGIAS Coated is built for efficient, high precision flat bottom drilling in steel and alloys. With a 7. 40 mm diameter and a 3xD length ratio, it achieves greater drilling depth while maintaining accuracy. Diameter: 7. 40 mm Geometry: Flat bottom design for precise bottom holes Length to diameter ratio: 3xD for enhanced drilling depth Cooling: Through coolant channel for effective chip evacuation