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1×3×40L High-Accuracy Carbide Precision Center Drill. Superior Wear Resistance: 64-67 HRC hardness resists abrasive wear 3 times longer than standard HSS. Wide Material Compatibility: Suitable for steel, stainless steel, cast iron, copper, aluminum, and plastics. Customization Options: Custom geometries, flute lengths, and special coatings like TiN or TiAlN available. Fast Sample Delivery: Samples delivered in 3-7 workdays via TNT, EMS, DHL, Fedex, or UPS. High Toughness: Balances hardness with impact resistance to withstand high torque and stress. Multiple Coating Choices: Available with TiN, TiAlN, TiC, or uncoated finishes based on requirements.