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Nq H9 Impregnated Core Drill Bits. 15mm Standard Crown Height: 25-30% more drilling footage than industry average, reducing replacement frequency. 6 Matrix Series for All Strata: H3 to H13 options cover soft to ultra-hard rocks, eliminating bit switching needs. Customizable Crown & Water Outlets: Crown height and water outlet designs are fully customizable to specific drilling needs. Vacuum Sintering Technology: Unique technology significantly improves sharpness and extends drill bit lifespan. Fast Delivery Options: 3-7 days for standard orders; urgent orders can ship within 3 working days. OEM/ODM Customization Service: Supports full customization including diameter, matrix, label, and logo with drawings.