1. Premium Cobalt Drill Bit Set: Our 25-piece cobalt drill bit set is made of high-quality HSS (high-speed steel), ensuring excellent durability even in the toughest drilling tasks. The content of cobalt enhances the hardness and heat resistance of the drill bit, making it suitable for drilling hardened steel, stainless steel and other hard materials. 2. Advanced and efficient drilling design: Our drill bits feature an advanced 118-degree bifurcated point angle for precise and easy drilling. The short chisel blade design reduces drilling resistance for smooth and efficient drilling operation. Each drill bit is carefully crafted to provide consistent and reliable performance. 3. Convenient storage and organization: Our cobalt drill bits come in a heavy-duty metal storage box that provides safe and organized storage for your tools. The sturdy storage box with indexing ensures that each drill bit is fixed in place and can be easily accessed at any time. No more searching for misplaced or scattered drill bits! 4. Various sizes for various applications: This drill bit set contains a variety of sizes from 1 mm to 13 mm, providing abundant choices to meet your drilling needs. Whether you're undertaking a DIY project, woodworking or a professional application, our comprehensive range of kits has something to suit your needs.