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75mm Fast Shipping Rotary Geological Exploration Drill Rock PDC Core Drill Bits. Customizable Color: Color is customizable to meet specific project requirements. High Efficiency Design: Features fast speed and high efficiency for medium hard and hard rock formations. ISO9001 Certified: Manufactured under ISO9001 certification ensuring quality standards. OEM/ODM Support: Full customization available from samples, designs, or full customization. Fast Delivery: Efficient production line ensures timely delivery and short lead times.