Feature:1. Special designed for pearl beads punching, jewelry processing and making.2. Uses high quality high speed steel material, durable and wear resistant, long‑lasting.3. 1.0mm straight shank twist drill bit, perfect for pearl punching machine, easy to install.4. Come with a plastic storage case, convenient to carry and easy to use.5. High hardness, corrosion resistance, impact resistance, stability and reliability.Specification:Item Type: Drill BitMaterial: High-Speed SteelProduct Specifications: Approx. 1mm / 0.04in Package List:10 x Drill BitNote:1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.