General description 20Pcs 1mm/0.04“ Diamond Twist Drill Bits are designed for high-speed drilling in various materials. Made from diamond-coated high-speed steel (HSS) using advanced spiral technology, these bits offer exceptional toughness and hardness, making them durable and reliable for precision drilling. Technical specifications Shank Diameter: 1.0 mm / 0.04 inch Drill Bit Diameter: 1.0 mm / 0.04 inch Color: Silver Package Contents: 20 Diamond Twist Drill Bits Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with rotary machines such as hand drills, drill presses, flexible drills, bench drills, and hanging grinders. Usage Suitable for drilling small holes in glass, metal, shells, jade, pearls, marbles, stones, drywall, and wires. When drilling, it is essential to use cutting fluid for lubrication and cooling to enhance drill hole quality and prolong the bit's lifespan. Note: Cannot be used for drilling wood, as the heat generated during high-speed