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This is a set of three titanium-coated high-speed steel (HSS) step drill bits. These conical-shaped bits are designed to drill multiple-sized holes in thin materials like steel, aluminum, copper, plastic, and wood with a single bit. Each bit features clearly marked steps indicating the hole diameter, allowing for precise drilling and deburring or enlarging existing holes. The titanium coating provides increased durability and longer life. This set offers a versatile range of hole sizes, making it a valuable addition to any DIY enthusiast's or professional's toolkit.