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Solid Carbide Flat Bottom Drill Bit with Coating. High Hardness Material: Tungsten carbide with HRC 45-65 hardness options for durability. Advanced Coating Options: Available with AlTiN, TiAlN, TiSiN, DLC, and Diamond coatings. Wide Application Range: Suitable for copper, cast iron, steel, titanium alloy, and heat-treated steel. Customizable Dimensions: Overall length 38-330mm and flute diameter 0.3-40mm fully customizable. Special Cutting Edge Design: Enhanced cutting ability extends tool and machine lifetime. Heat-Resistant Coating: HELICA coating enables high-speed processing with heat resistance. Smooth Flute Design: Wide flute design ensures easy removal of cuttings.