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Concrete Drilling Barrel Diamond Drill Core Bit. Customizable Color: Color is customizable to meet specific customer requirements. High Efficiency: Features fast speed and high efficiency for metal and masonry drilling. ISO9001 Certified: Manufactured under ISO9001 certification standards for quality assurance. Wide Diameter Range: Diameters range from 6mm to 60mm to suit different drilling needs. OEM/ODM Support: Full customization available from samples, designs, or full customization. Durable Materials: Constructed from Alloy Steel, Diamond, and Carbide for hardness. 100% Quality Inspection: Every finished product undergoes visual and function inspection.