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Crown Drill Shank with Internal Coolant for Deep Hole Applications. High Machining Efficiency: 8 times efficiency of conventional drills, over 3 times faster. Durable Design: Anti-vibration, durable, smooth chip removal, vacuum heat treated. OEM/ODM Support: Flexible customization for model numbers and machining requirements. Wide Application: Suitable for mold making and deep hole applications on CNC machines.