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0.8×4×40L High-Precision HRC65 Carbide Drill Bit. Superior Hardness: Hardness of 64-67 HRC resists abrasive wear 3 times longer than standard HSS. Wide Material Compatibility: Suitable for steel, stainless steel, cast iron, copper, aluminum, and engineering plastics. Custom Coating Options: Available with TiN, TiAlN, TiC, or uncoated finishes tailored to needs. Fast Sample Delivery: Samples delivered in 3-7 workdays via express couriers like DHL or FedEx. Bulk Delivery Options: Bulk orders shipped in 7-30 workdays by air or sea freight. High Toughness Design: Balances hardness with impact resistance to reduce breakage risk.