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Solid Carbide HRC55 Coated Flat Bottom Drill Bits with Coating for Bardened Steel. High Hardness Material: Made of Tungsten Carbide with hardness HRC 45-65 for durable drilling. Advanced Coating Options: Available with AlTiN, TiAlN, TiSiN, and DLC coatings for various materials. Wide Customization Range: Customizable overall length from 38-330mm and flute diameter 0.3-40mm. Versatile Application: Suitable for wood, metal, copper, cast iron, stainless steel, and titanium alloy. Fast Delivery Time: Standard delivery within 3-5 days for most orders. OEM and ODM Services: Full customization available from samples or designs with flexible options. Strict Quality Control: 100% inspection including visual and function checks on finished products.