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HRC50 Special Metal Drilling Tool Carbide Flat Bottom Drill Bits Drill Cutter. High Hardness Material: Made of tungsten carbide with HRC55-58 hardness and 3200 HV. Advanced Coating Options: Available with AlCrSiN, AlTiN, TiAlN, TiSiN, DLC, or Diamond coatings. Versatile Application: Suitable for wood, well, metal, copper, cast iron, and stainless steel drilling. Customization Available: Supports OEM/ODM, full customization, and flexible design adjustments. Efficient Chip Removal: Smooth and wide flute design ensures easy removal of cuttings. Strict Quality Control: 100% visual and function inspection for every finished product. Competitive Pricing: Price competitive with samples available for quality verification.