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Diamond Core Drill Bit for Granite. High Drilling Speed: Thinner diamond segment and tube wall reduce resistance for faster drilling. Low Drilling Pressure: Requires minimal pressure, reducing operator fatigue and equipment strain. Reinforced Concrete Capability: Especially effective for drilling through reinforced concrete structures. SGS Certified: Product meets international safety and quality standards verified by SGS. Customizable Sizes: Available in outer diameters ranging from 6mm to 102mm. OEM and ODM Services: Full customization, minor customization, and design-based options available. Fast Delivery: Delivery within 2-3 weeks after payment confirmation.