[MATERIAL] Diamond-coated high-speed steel (HSS) made using spiral technology, offering both toughness and hardness, and resistant to breakage. The drill bit is sharp and facilitates efficient chip removal. [APPLICABLE MACHINE] Compatible with rotary tools such as hand drills, drill presses, flex shafts, bench drills, and hanging mills. [APPLICATION] Suitable for drilling small holes in glass, metal, sea shells, jade, pearls, marble, stone, and drywall. Performance may vary depending on material hardness. [NOTICE] Use cutting fluid during operation to ensure proper lubrication and cooling, which improves hole wall quality, extends tool life, and maintains drilling accuracy. Shank Diameter: 1.0 mm / 0.04 inch Drill Bit Diameter: 1.0 mm / 0.04 inch 1. Not suitable for drilling wood. High-speed rotation generates excessive heat, which may burn wood. 2. Low-speed drilling increases risk of breakage or diamond particle loss. 3. To prevent slippage, minimize the exposed length of the drill bit to maximize stability and strength. Color: Silver Material: Diamond-coated HSS Package Contents: 20 x Diamond Twist Drill Bits Note: Color representation may vary slightly due to lighting and display settings. Measurement tolerance: ±1–3 mm.