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This HSS step drill bit set is designed for both woodworkers and machinists, enabling precision boring of holes ranging from 1/8 to 7/8. The 3-piece set comes in a size range of 1/8, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, and 7/8 for versatile applications. Its high-speed steel construction provides superior wear resistance, heat reduction, and long-lasting performance even in demanding situations. With an accuracy of +/-0.001, it reduces drill press calibration time while the step drill bits prevent over-drilling holes with consistent starting points that meet ISO9002 standards for industrial precision. Ideal for wood, plastics, aluminum and steel materials, this set is perfect for machinists, toolmakers, technicians, mechanics, maintenance professionals in workshops, machine shops, construction sites or plants within the power tools industry.