Our Alloy Solid Carbide Precision 5D Twist Drill Bits with inner coolant are carefully ground for smooth cutting and stable chip evacuation. Universal drill series covers a diameter range from 0.1 - 20 mm and provides 5xD drilling capability. Manufactured to strict industry standards or custom specifications to suit various mold and metal machining applications. These tungsten steel drills deliver high-performance cutting with extended tool life for continuous production runs. All drill bits adopt high-density carbide substrate with precision ground cutting edges to reduce chipping and breakage. The built-in internal coolant channel delivers direct lubrication to the cutting zone, lowering cutting temperature and preventing thermal damage to tools and workpieces. Non-standard dimensions and special flute geometries, point angles can be customized upon request. Tight diameter tolerance is maintained to guarantee consistent hole accuracy.