【High-Quality Cobalt M35 HSS Drill Bits】 ERNERTWIST Cobalt Drill Bit Set features high-speed steel (HSS) bits with 5% cobalt content, ensuring superior hardness and durability for drilling through tough materials like hardened metal, stainless steel, cast iron, wood, and plastics. 【Optimized 135° Split Point Tip】 Each drill bit is designed with a 135° split point tip, which allows for easy and accurate starting, reducing the risk of slipping and ensuring clean, precise holes in diverse materials. 【Twist Shape for Efficient Drilling】 The twist shape design of these drill bits enhances chip removal and reduces heat buildup during drilling, making the process more efficient and extending the life of the bits. 【Versatile Metric Sizes】 This comprehensive set includes 99 pieces of twist jobber drill bits ranging from 1.5mm to 10mm, providing a wide array of sizes to tackle various projects and applications. The metric sizing ensures precision and compatibility with your metric tools. 【Tough Metal Index Storage Case】Keep your bits organized and easily accessible with the included sturdy metal index storage case. The compact design allows for easy storage in your toolbox or workbench, ensuring you can find the right size when you need it. 【What You Get】1.5mm x 16pcs,2mm x 16pcs,2.5mm x 15pcs,3mm x 10pcs,3.2mm x 10pcs,3.5mm x 8pcs,4mm x 8pcs,4.5mm x 3pcs,5mm x 3pcs,5.5mm x 2pcsw,6mm x 2pcs,6.5mm x 2pcs,8mm x 2pcs,10mm x 2pcs The ENERTWIST Cobalt Drill Bit Set is an exceptional collection of 99Pcs HSS Twist Jobber Drill Bits, designed to cater to a wide range of drilling needs. This comprehensive set includes drill bits with a 135° M35 metric design, making them ideal for working with hardened metal, stainless steel, cast iron, wood, and plastics. The cobalt steel material ensures durability and long-lasting performance, even under heavy use. Each bit in this set features a precise twist jobber design that provides efficient chip removal and reduces the risk of overheating during extended drilling tasks. The bits are available in sizes ranging from 1.5mm to 10mm, offering versatility for various applications. Whether you're tackling small precision work or larger projects, this set has you covered. To keep your bits organized and easily accessible, the set comes with a sturdy metal index storage case. This case not only protects your bits but also makes it simple to find the right size when you need it. The compact design of the case allows for easy storage in your toolbox or workbench. In summary, the ENERTWIST Cobalt Drill Bit Set is a high-quality, versatile, and durable option for both professional and DIY users. With its extensive range of sizes and robust construction, this set is perfect for tackling a variety of materials and drilling tasks with ease and precision.