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The Irwin Step Drill Bit Set is an essential tool for anyone working with metal, offering superior performance in a wide range of drilling tasks. Made from durable high-speed steel, these cobalt bits are perfect for drilling into hard materials such as stainless steel, cast iron, and aluminum. With 28 unique hole sizes and easy-to-use step increments, this set offers unparalleled precision for consistent results. Its straight shank ensures secure fastening, while its bright/uncoated finish reduces friction and resists heat build-up. Save time and effort with Irwin's Step Drill Bit Set - the ultimate solution for your drilling needs.