Multiple Sizes for Versatile Usage? : With 115 pieces, our set covers 29 fractional sizes, 26 letter sizes, and 60 numbered wire gauges from #1 to #60. The storage case with labeled compartments keeps them organized and accessible anytime. Premium Quality HSS Material? : Made of M35 high-speed steel with 5% cobalt, these bits stand out with their exceptional hardness and long-lasting durability. They are perfect for precise drilling in hard materials, including stainless steel. Optimized Point Design for Faster Drilling? : The split point with a 135-degree angle provides more cutting edge contact for faster and easier drilling, and twisted shanks help clear metal shavings. These features make our bits perfect for both DIY projects and professional use. Versatile Set for All Your Drilling Needs? : Our drill bits handle not only hard metals, such as cast iron, but also soft materials like wood and duroplasts. This versatile set meets all your drilling needs. 100% Satisfaction Guaranteed? : Our commitment to your satisfaction is absolute. We stand behind our product with complete confidence.