1. Improved Durability and Efficiency: The combination of titanium coating and cobalt HSS provides outstanding durability, maintaining efficiency and resisting damage from heat and abrasion during extended use. 2. Precision and Stability Combined: Crafted with a fullgrinding process to reduce vibration and confirm dimensional accuracy, enabling effortless and smooth drilling performance. 3. Versatile Metalworking: This twist drill bit set is designed for metalworking, offering powerful penetration in materials like cast iron while ensuring versatility and good performance for various drilling tasks. 4. Optimized Bit Management: Equipped with a solid case featuring assigned slots, it provides rapid access, reduces loss risks, and improves ease of transport for your drill set. Usage scenarios Drilling cast iron workpieces such as engine components, castings, and machinery housings where wear resistance and stable performance matter. Fabrication or tasks involving steel plates, tubes, or other metals that require precise, clean holes. General metalworking projects in workshops or maintenance settings, including aluminum profiles or miscellaneous metal drilling tasks, where durable bits and organized storage improve efficiency.