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Enhanced Wear-Resistant Silicon-Based Coating Micro Drill Bit. Superior Hardness: 64-67 HRC hardness resists abrasive wear 3 times longer than standard HSS. Custom Coatings: TiN, TiAlN, TiC, and Uncoated options available for specific requirements. Fast Sample Delivery: Samples delivered in 3-7 workdays via TNT, EMS, DHL, Fedex, or UPS. High Toughness: Excellent impact resistance withstands high torque and sudden stress. Versatile Applications: Suitable for steel, stainless steel, cast iron, copper, aluminum, and plastics.